Planning event T-shirts? Learn how to estimate quantities, choose a sensible size split, build in spares and avoid costly unused stock.
Ordering custom T-shirts for an event sounds simple until you have to choose the actual quantities and sizes. Order too few and popular sizes disappear first. Order too many and you can be left with boxes of date-specific shirts that are difficult to use afterwards.
The best approach is not to begin with a generic size ratio. Start with the people you know are coming, collect sizes wherever possible, decide what the shirts are for, then add a controlled buffer for uncertainty. Generic percentages should be a fallback when real participant data is unavailable.
Event T-shirts and group clothing
If every confirmed attendee is meant to receive a shirt, use confirmed headcount as the base and add a modest contingency, often around 5–10%, for late additions, size swaps, damaged items or people missed from the list.
If shirts are optional merchandise for sale, do not print one for every attendee. Use pre-orders, previous sales and a conservative first run. When demand is uncertain, the ability to reorder can be more valuable than the lowest possible bulk unit price.
If you can collect exact sizes before production, do it. A real list of 18 Small, 31 Medium and 27 Large orders is more useful than any internet formula.
Quantity planning changes depending on purpose.
For a charity run, conference or paid event where a T-shirt is promised with the ticket, tie quantity closely to registrations. Collect size during registration and set a deadline after which size choice is no longer guaranteed.
For a known team, collect each person's size. Consider whether staff need more than one shirt for a multi-day event. This category is easier to forecast because the wearers are identifiable before production.
If shirts are handed out without reservation, demand is less predictable. Decide whether everyone should receive one or whether the giveaway is deliberately limited. A limited quantity can control budget, but communicate it clearly.
Sales stock is where over-ordering becomes expensive. Attendance does not equal merchandise demand. Sales depend on price, design, audience, competing products, weather and whether people can buy online later.
For a first event, a smaller run plus a reorder route is often safer than treating venue capacity as a sales forecast.
The strongest forecast comes from information you already have: registration forms, staff rosters, previous event sales by size, pre-orders, ticket sales and membership records.
For recurring events, record not only total stock left over but which sizes ran out and which remained. Finishing with 20 shirts may look like over-ordering, but if 16 are XS while Medium and Large sold out early, the real problem was the size mix.
There is no universal buffer. For a known attendee list, 5–10% can be a practical planning range, but the correct figure depends on uncertainty.
A smaller buffer may be enough when registrations are closed and sizes are confirmed. More may make sense when people can register late, volunteers are still being recruited or exchanges are likely.
Extras should have a purpose: late attendees, replacements, size exchanges, staff additions, sponsor requests or archive samples. Avoid adding a large percentage simply because extras might be useful. Event-dated stock can lose value immediately after the event.
The best breakdown is the one supplied by actual wearers. When that is impossible, current UK custom-clothing data can provide a starting point.
A.M. Custom Clothing analysed nearly 1,000 orders and found unisex demand concentrated most heavily in Medium and Large, followed by Small and XL, with smaller shares at XS and extended sizes. That is useful evidence, but it should not be copied blindly into every event order.
Audience composition changes the curve. A student society, construction workforce, children's event and mixed public festival will not necessarily need the same sizes. Also check the specific garment manufacturer's size chart because one brand's Medium can fit differently from another's.
A better process is to publish the size chart early, collect sizes during registration or pre-order, lock the confirmed list before production, use market ratios only for unallocated spare stock, and record what was actually used for next time.
Ordering 100 shirts as 20 each of S, M, L, XL and 2XL looks tidy, but real demand rarely distributes evenly. Published UK order data shows a stronger concentration around Medium and Large. An equal split can therefore leave you short of popular sizes while slower-moving sizes remain.
The goal is not perfect prediction. It is reducing obvious mismatch.
Often, yes, if you have no better audience signal. Medium and Large are useful places to hold some unallocated contingency because they are prominent in general unisex order data.
But follow your own data first. If confirmed registrations show unusually high XL or 2XL demand, your attendees matter more than an industry average. Inclusivity also matters: do not exclude less common sizes simply because they represent a smaller percentage.
If shirts are retail merchandise rather than guaranteed giveaways, pre-orders can remove much of the guesswork.
Reveal the design before the event, open a limited pre-order window, collect size and payment, print confirmed orders, then add a smaller amount of event-day stock if desired.
This gives real evidence of demand and reduces cash tied up in unsold garments. For recurring events, combine pre-order data with previous on-the-day sales to improve the next forecast.
There is no single lead time because it depends on garment stock, quantity, artwork, print method and the printer's workload. UK event-printing suppliers commonly ask organisers to provide the event date, quantity, size breakdown and artwork before confirming production.
Work backwards from the date you need the garments in hand. Allow time for artwork, sponsor approvals, collecting sizes, stock checks, production, delivery and inspection. If hundreds of shirts arrive on the morning of the event, there is little recovery time if a box is missing.
Do not leave large orders sealed until distribution begins. Check total quantity, quantity by size, garment colour, print positions, staff or attendee variants and personalised details where applicable.
Event-management guidance for large races recommends inventorying delivered shirts rather than assuming the received size mix exactly matches the order. That simple check gives time to investigate discrepancies before event day.
Sometimes larger quantities reduce unit price, but a cheaper unit is not automatically a cheaper decision.
If 75 shirts cost more per unit than 100, ask what the extra 25 will be used for. If the design is evergreen and can be used later, rounding up may make sense. If the shirt says Summer Festival 2026, excess stock has a short useful life.
Compare total spend, not only unit price.
Digital methods such as DTG and DTF can make smaller runs commercially practical because they avoid some traditional setup requirements. Instead of placing one oversized order months in advance, an organiser may be able to print a confirmed quantity and top up later, subject to stock and production capacity.
This can suit community events, charity teams, club competitions, corporate days, university societies, creator meet-ups and first-time merchandise launches.
The trade-off is that later reorders depend on garment availability and deadlines. If exact colour and style consistency are critical, discuss top-up plans with the printer before relying on them.
Guessing sizes without asking attendees. A registration form can remove most uncertainty.
Treating attendance as merchandise sales. A 1,000-person event does not mean 1,000 people will buy a shirt.
Ordering for unit price rather than total need. Saving £1 per shirt is not a saving if 50 garments remain unused.
Forgetting staff and volunteers. Keep operational clothing separate from attendee stock.
Leaving extended sizes until the end. Collect actual sizes and include the range your audience needs.
Using a generic ratio without checking the blank. Fit varies between garment brands and styles.
Finalising sponsor artwork too late. Set an artwork deadline before the production deadline.
For a guaranteed-shirt event:
Confirmed recipients + expected late additions + deliberate contingency = planned quantity.
Build the size split from confirmed sizes first + evidence-based spare allocation second.
For merchandise sales:
Pre-orders + conservative event-day stock based on prior sales or audience evidence = planned retail quantity.
Keeping these scenarios separate prevents a major mistake: treating a giveaway and a retail product as if demand works the same way.
For a known attendee list, a modest 5–10% contingency is often reasonable, but use your event's uncertainty rather than applying a fixed percentage blindly.
Published UK order data from A.M. Custom Clothing shows Medium and Large as the largest categories in its sample of nearly 1,000 orders, followed by Small and XL. Use this as fallback evidence, not a substitute for collecting sizes.
Add a size question to registration and make the selection deadline clear. Use actual registrations for the main order and hold limited spares based on your audience and previous events.
Only if every attendee is guaranteed a shirt. If shirts are optional merchandise, attendance is not the same as sales demand. Pre-orders and previous sales are safer forecasting tools.
Often yes, especially with digital printing, but garment stock, colour consistency, production capacity and deadline matter. Ask your printer about top-up orders before building your plan around them.
The best event T-shirt quantity is not a magic percentage. It is a forecast built from real people, real sizes and the purpose of the garment.
Collect sizes whenever possible. Separate guaranteed recipients from merchandise buyers. Add a modest, deliberate buffer instead of an arbitrary pile of extras. Use general size ratios only for demand you genuinely cannot know. And count the finished shirts before event day.
For organisations trying to reduce stock risk, flexible short-run custom printing can make planning easier. ElitePrints supports low-quantity custom clothing for suitable products, allowing organisers to focus on ordering what they actually need rather than chasing a bulk number purely for the sake of it.
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