Tees are a seasonal product pretending to be a year-round one.

They move all year. But the volume is not flat.

Demand leans hard into spring and summer, with smaller bumps around back-to-school and the holidays.

A brand that buys a tee range like it buys hoodies evenly, safely, and deep on everything ends the season with boxes of the wrong weight in the wrong colors.

This guide fixes that. It walks the full seasonal buy in the order you actually decide it:

When tees peak, what weight to run, how to split the style mix, how to set quantities per style and color, how to build the size curve, when to start production, what to carry over, and how to chase the fast sellers.

It is written from the production side.

Every number here is a slot for your own floor data grep the file, drop your real figures in, and it becomes yours.

Chapter 01

Tee seasonality and peak demand:

Before you decide anything about weight or quantity, you need to know when the money actually shows up.

Tees don’t sell in one smooth curve. They sell in a big peak and a few smaller waves, and the buy has to be shaped to land ahead of each one.

Here is the shape of a normal tee year.

  • The main peak springs into summer. This is where the bulk of your yearly tee volume lives. Demand lifts as the weather turns and holds through the hottest months.
  • The back-to-school bump. A secondary wave in late summer and early autumn. Graphic tees and long-sleeve styles do well as buyers refresh their rotation.
  • The holiday gifting spike. Smaller and shorter. Graphic and branded tees sell as gifts and add-ons. Weight matters less; the design carries it.
  • The quiet stretch deep winter. Tees become a layering piece, not a hero. Basics and core colors tick along; new seasonal drops don’t.

Buy to land before the window, not into it:

The most expensive timing mistake is landing stock as the peak is already ending.

Sell-through depends on how many selling weeks the product gets.

Miss the front of the window, and you lose the weeks that matter most.

As a planning rule, aim to have bulk stock on the shelf roughly six to eight weeks before the demand window opens.

That gives you full-price selling weeks at the front, where margin is best, before markdowns even come up.

Floor rule:

A late buy doesn’t just land late; it gets squeezed at sampling, which is the stage you can least afford to rush.

Expect roughly two to four sample rounds before sign-off, and each round costs both money and time.

Rushed sampling is the single most common cause of bulk-quality failure we see.

Start early enough that sampling gets its full rounds. Our guide to the clothing sampling process walks through each stage.

The window shifts by hemisphere and region, so map it against the markets you actually sell into before you commit to dates.

Chapter 02

Weights and fabrics by season:

Weight is the lever most brands get wrong.

They pick one house weight and run every style and every season on it.

But a tee that feels premium in October feels heavy and wrong in July.

The season should set the cloth.

This chapter is about which weight goes where in the buy, not what GSM means.

If you need the numbers themselves, what a GSM figure actually is, and how 180 vs 240 vs 280 GSM compare, start with our full t-shirt GSM guide, then come back here to allocate weight across the season.

Which weight leads which season?

Season slot Weight range Why it fits the buy
Peak summer ~180 GSM Airflow and drape. Hand-feel sells when it’s hot.
Spring/autumn core 180-240 GSM The year-round workhorse. Safest range to buy deep.
Shoulder / premium 240-280 GSM Structure for boxy fits; extends sales into cooler edges.

The allocation logic, not the physics:

  • Lead the summer buy with the light end. When it’s hot, breathability is the sell. Put your lighter cloth at the front of the peak.
  • Anchor the range in the middle. A mid-range weight works spring through autumn, so it’s where you can commit depth without stranding stock.
  • Reserve the heavy end for structure and shoulder seasons. Boxy and oversized fits need the weight to stand up, and heavier cloth stretches your tee sales into the cooler edges of the calendar.

Fabric and finishing shift sell-through too:

Weight is one axis; construction is the other.

Combed, ring-spun cotton gives the smooth hand, and a clean print surface buyers read as premium.

A blend buys drape or shrink resistance.

And the construction choices that decide whether a tee survives its first wash are their own decision; see the details that make a tee last.

Finishing is where seasonal buys quietly lose time.

Every wash or finish adds at least a few days of lead time; enzyme adds the least, and garment dye the most.

If your summer story leans on a washed or garment-dyed look, lock the finish before you cost the buy and before you set the order date.

Our garment wash types guide compares each process on cost and lead time.

Buyers can feel weight through a screen if you show it. A photographed GSM ladder does more for trust than a paragraph of adjectives.

Chapter 03

The style mix for the season:

A seasonal tee range is not one product. It’s a balanced set of jobs.

Some styles drive demand, some carry margin, and some just keep the shelf full.

This chapter is about the ratio for the season, not the styles themselves.

For what each style is and when to use it, our guide to the 12 t-shirt styles is the reference.

Here we’re only deciding how much of the buy each role should take.

Four roles do the work in a streetwear tee buy:

  • Graphic tees are the demand driver. Trend-led, high pull, sells fast when it hits. Also the highest risk, because a graphic that misses is dead weight.
  • Boxy/oversized is the silhouette play. Fit-led rather than print-led. Justifies the heavier weight and gives the range its current shape.
  • Basics/blanks are the reliable spine. Lower margin, steady sell-through, rarely marked down. Anchors the range.
  • Long-sleeve: the season extender. The bridge piece that pulls the range into the shoulder seasons and catches the back-to-school wave.

A starting split for a seasonal buy:

No universal ratio exists. But a sane starting frame for a streetwear tee season looks like this; then you bend it to your own sell-through history.

Style role Share of the buy Why
Graphic tees ~35% Demand and traffic, controlled risk.
Boxy / oversized ~25% Silhouette and heavier weight.
Basics / blanks ~30% Reliable sell-through, carry-over.
Long-sleeve ~10% Extends the selling window.

A starting frame for planning, not a rule. Your own sell-through history beats it every time.

The mistake to avoid:

Loading the buy with graphics because they’re the fun part to design. Graphics are the highest-risk slice of the range. They should never be the deepest.

Chapter 04

Setting quantities per style and color:

This is the core decision, the one that decides whether you sell through or sit on stock. Everything before it was set up.

Quantity is where money is committed. The whole game is spreading risk so no single bet can sink the season.

Start from the total, then tier down:

Don’t build the buy style by style from the bottom up. You’ll overcommit. Start from your total seasonal tee budget in units, then divide it by certainty.

Tier Share of units Buy posture
Hero (proven) ~55-60% Deep. Never out of stock.
Core (confident) ~30% Moderate. Room to reorder.
Experimental (new) ~10-15% Shallow. Test, then chase.

Hero is proven styles, and color depth is safe here.

Core is styles you’re confident in but haven’t proven at this depth.

Experimental is new graphics and untested ideas: small, controlled buys, so a miss is contained, and a hit becomes a reorder.

Color depth: hero colors deep, fashion colors shallow

  • Hero colors run deep. Black, white, and your one or two proven staples carry most streetwear tee volume. Buy them like you mean it.
  • Fashion colors run shallow. Trend colors are the experimental tier of color. A shallow buy that sells out looks like scarcity; a deep buy that doesn’t looks like a markdown.
  • Every color carries its own minimum. Each colorway has its own minimum order and setup. More colors means more small commitments and more ways to end up with orphan stock. Fewer, deeper colors usually sell through cleaner.

Floor rule:

A new color is never just a new color.

On a bill of materials, every extra colorway gets its own block of the components that change with color, like dyed fabric, matched thread, and some trims, each sourced and priced separately.

That’s where per-color minimums come from, and why a ten-color range costs far more to run than its unit count suggests.

Before you add a colorway, check what it adds to the BOM. Our garment bill of materials checklist shows how.

Chapter 05

The sizing curve for tees:

You can nail the weight, the styles, and the quantities and still get stuck with leftover stock because you bought a flat-size run.

Real demand isn’t flat across sizes. A realistic curve is what stops you from drowning in unsold smalls and 3XLs.

Streetwear skews to the middle and is slightly large:

Buyers cluster around M and L, with a lean to the larger side in streetwear. The tails are real but thin. Buy them thin too.

Size Share of the run
S ~12%
M ~25%
L ~28%
XL ~20%
2XL ~10%
3XL ~5%

 

A starting default for a standard-fit streetwear tee. Replace it with your own sell-out data as soon as you have a season of history.

Shift the curve for the fit:

  • Oversized and boxy fits pull the curve down a size. People size down when the cut already runs big. Weight more into S and M than for a standard fit.
  • Use your own returns and sell-out data first. The table above is a default, not gospel. Your history beats any generic curve.
  • Decide on extended sizes deliberately. Offering 3XL and up is good for reach, but buy those sizes shallow until the data proves demand, so you don’t strand units in the tail.

A perfect buy in the wrong size curve still ends the season with dead stock. The curve is where quantity meets reality.

Chapter 06

Production timing for a seasonal launch:

You already know you want stock on the shelf weeks before the window opens.

The trap is that the production clock is longer than most first-time founders think, and it gets longer right when everyone else is booking too.

Work backwards from the on-shelf date:

Fix the date you need stock live.

Then subtract every production stage to find the date you must place the order.

Don’t estimate forward from today; you’ll always be optimistic. Count backwards.

  • Sampling and approval. Four stages: proto, fit, strike-off, and pre-production, and typically two to four rounds before sign-off. Each round adds time, so this is where schedules slip first.
  • Fabric. Usually the longest single step: knitting or sourcing greige, then dyeing to color. Custom colors and special fabrics stretch it further.
  • Bulk production. Cut, sew, print, or embroider. Decoration method and order size both move this number.
  • Finishing and QC: Wash, press, inspect, pack. Every wash or finish adds at least a few days; garment dye, the most.
  • Freight and customs. Sea is slow and cheap; air is fast and expensive. Treat air as the emergency lever, not the plan.

Book before the crunch:

Factories fill up before peak.

Two things reliably compress capacity and stretch lead times:

Holiday shutdowns and Eid here in Pakistan and Chinese New Year across much of the supply chain, which pause production and create a booking rush on either side, and everyone is chasing the same summer window at once.

The brands that book early get the slots. Latecomers get quoted longer.

Build a buffer on top of the quoted lead time. Something always slips:

A fabric delay, a resample, a freight hold. Buffer is what keeps a slip from turning into a missed season.

The biggest single protection is front-loading development: seal color, fit,, and wash in sampling, so nothing gets reopened once bulk starts.

Chapter 07

Core carry-over vs. seasonal-only:

Not everything in a tee range should live and die with the season.

Splitting the range into carry-over and seasonal-only is how you build a stable spine while keeping the drops fresh, and it’s one of the biggest levers on waste.

Carry-over: the spine you never sell out of:

  • Proven basics: in your mid-range house cloth.
  • Hero colors: the black-and-white core that always moves.
  • Best-selling fits: validated over multiple seasons.

Carry-over earns its name: buy it deeper, reorder it on a rhythm, and never mark it down, because it isn’t tied to a trend that expires.

Seasonal-only: the drops that create urgency

  • Trend and fashion colors tied to this specific season.
  • Graphics and limited designs meant to sell out and not return.
  • Weight-specific pieces and lightweight summer-only cuts.

Seasonal-only is bought shallow on purpose.

Selling out is the goal, not a failure. Scarcity is a feature of a drop.

The ratio to aim for:

A healthy tee range leans on a stable carry-over base with a seasonal layer on top, roughly 60% carry-over to 40% seasonal as a starting frame.

The carry-over spine carries baseline revenue and cuts waste.

The seasonal layer keeps the brand current and gives buyers a reason to come back each drop.

Chapter 08

Reorder strategy for fast sellers:

The best-case problem in any season is a style that sells faster than you expected.

It’s also the easiest place to leave money on the table.

When a winner sells out and can’t be replaced in time, that empty shelf is pure lost margin.

Reorder strategy is how you protect momentum.

Spot the fast sellers early:

  • Watch velocity, not stock level. When a style is clearly outselling the rest of the range in its first few weeks, flag it as a reorder candidate right away. Set your own threshold and stick to it.
  • Act on the trend, not the sell-out. The reorder decision has to happen while stock still exists, because production takes time. Wait for zero, and you’ve already lost the window.

Hold fabric to shorten the reorder clock:

This is the highest-leverage move in the whole guide.

The longest step in a reorder is almost always the fabric.

Remove that step and a reorder moves dramatically faster.

  • Hold fabric on your proven hero styles and colors. The cloth is already made; you’re only booking cut, sew, and finish.
  • Only on carry-over and proven winners, never on experimental buys. Holding fabric on a style that doesn’t sell is just a slower form of dead stock.
  • It turns a chase into a real option. With fabric on hold, chasing a fast seller becomes a quick, low-risk decision instead of a long, expensive gamble.

Floor rule:

Know which state you’re holding the fabric in. Greige held undyed skips the knitting but still has to be dyed, so the dye step stays on the reorder clock.

Fabric held already dyed in your hero colors skips both.

And if the style is garment-dyed, remember that the finish itself carries the longest lead time of any wash, so held fabric shortens that reorder but never makes it instant.

Chase or let it ride?

Not every fast seller should be reordered.

Ask two questions first. How many selling weeks are left?

Late in the season, a reorder can land in a dying market, and letting a winner sell out cleanly can beat chasing it into markdown. And is it carry-over or a moment?

A proven carry-over style is a clear reorder.

A trend graphic that happened to pop may be better left as a sold-out success that builds demand for the next drop.

Putting the buy together:

A seasonal t-shirt buy that sells through isn’t luck.

It’s a sequence of decisions that each carry their own risk.

Know the window. Match weight to season. Balance the style mix.

Tier your quantities by certainty. Buy a realistic size curve. Land stock early.

Split carry-over from seasonal. And hold fabric so you can chase the winners.

Do those eight things, and the range covers its own bets.

The hero tier carries revenue, the experimental tier stays small enough to be safe, and the fast sellers become reorders instead of regrets.

Think about your last tee buy. Which part ended in dead stock:

The weight, the color count, or the size curve? That’s usually where the next buy gets fixed first.

Frequently asked questions

Work backwards from your on-shelf date.

Aim to land bulk stock roughly six to eight weeks before the demand window opens, then stack the full production clock sampling, fabric, bulk, finishing, QC, and freight on top of that to find your order date.

Add a buffer, because something always slips.

Lead the peak-summer buy with the lighter end of the range, around 180 GSM, for breathability and drape.

Keep a mid-range weight as the year-round core, and reserve 240 to 280 GSM for boxy, structured, or transitional styles.

Season sets the weight; don’t run every piece on one house GSM.

Tier the buy by certainty. Put the deepest units behind proven hero styles and colors, a moderate buy behind confident seasonal styles, and a small, controlled buy behind experimental graphics. Depth follows what you’ve proven, not what’s exciting to design.

Weight the curve toward M and L, with a slight lean to the larger side, and keep the smallest and largest sizes thin. Shift the whole curve down a size for oversized and boxy fits, and override the default with your own returns and sell-out data wherever you have it.

For proven fast sellers and carry-over styles, yes. Holding fabric removes the longest step from the reorder clock, so you can chase a winner far faster than a from-scratch reorder. Never hold fabric on experimental buys.

Fewer, deeper colors usually sell through more cleanly than many shallow ones. Run hero colors like black and white deep; keep fashion colors shallow, and remember every extra colorway carries its own components, minimums and setup.

From the T-shirt manual

This is one chapter of The Complete T-Shirt Manufacturing Guides:

These chapters cover taking a T-shirt brand from idea to shipped units, costing, sourcing, tech packs, QC, freight, and launch comparisons. All written from the Sialkot factory floor of Gibben Clothing.

Open The Full T-Shirt Guides

On the floor · Sialkot

Written by

Faizan Ahmad

Chief Apparel Technologist & Head of Manufacturing, Gibben Clothing · Sialkot, Pakistan

Faizan leads production at Gibben Clothing, a cut-and-sew streetwear manufacturer in Sialkot, with 8+ years turning raw yarn into retail-ready hoodies, tees, bottoms, jackets, tracksuits, and headwear. He doesn’t just write about clothing; he works the floor, so every guide here is grounded in real fabric behavior, QC standards, and production data from live runs.