The design gets all the attention, but sizing is where leavers hoodie orders actually go wrong. Get it right and everyone's happy on leavers' day. Get it wrong and you've got one leaver drowning in an XXL, another who can't get the zip up, and a rep fielding awkward messages after it's too late to fix. The good news: with a bit of planning, sizing a whole year group is straightforward. This guide walks you through how leavers hoodies are sized in the UK, how to measure properly, and how to run a group size collection that doesn't fall apart.
How leavers hoodies are sized in the UK
Most leavers hoodies come in two sizing families: youth (kids') sizing and adult sizing.
Youth sizes are usually labelled by age — 5–6, 7–8, 9–11, 12–13 and so on — or occasionally by height. These suit primary school Year 6 leavers and some younger secondary groups.
Adult sizes run XS, S, M, L, XL, XXL and up, and they're what most secondary, sixth form, college and university groups will want. Adult hoodies are cut longer in the body and arms than youth ones, so an "age 12–13" and an "adult XS" are not the same shape even where the chest measurement is similar.
The single most important number is the chest measurement, given as either the garment's flat chest width or the "to fit" chest size. Hoodies are pullover or zip layers designed to go over other clothes, so they carry a bit of room by design — you don't size them like a fitted t-shirt.
How to measure for the best fit
You don't need everyone to own a tape measure. The easiest, most reliable method is to measure a hoodie that already fits well.
Take a hoodie the person likes wearing, lay it flat, and measure straight across from armpit to armpit — that's the chest width. Then measure from the top of the shoulder seam down to the hem for the length. Compare those two numbers to the size chart and pick the closest match. This "measure a hoodie you own" trick beats measuring the body directly, because it accounts for how that person actually likes their hoodies to sit.
If you are measuring the body instead, run the tape around the fullest part of the chest, keep it level, and don't pull it tight. Add a little room for comfort and for layering underneath.
Youth vs adult sizing: which should your group choose?
For primary school Year 6 leavers, youth sizing is usually right, with a couple of adult XS/S options for the taller pupils. See our primary school leavers hoodies range for age-based options.
For secondary, sixth form, college and university groups, adult sizing is the standard choice. By Year 11 most students are more comfortable in adult fits, and it gives you a cleaner range of sizes to manage.
If your group sits on the boundary — a Year 7 or 8 cohort, say — it's worth offering both a top youth size and a couple of small adult sizes so nobody's forced into a fit that's wrong for them.
Should you size up? The oversized question
Oversized leavers hoodies have been a trend for a while, and plenty of leavers deliberately want a size up for that relaxed, borrow-it-from-a-mate look. There's nothing wrong with that — as long as it's a choice, not an accident.
The rule of thumb: let people order their true size by default, and let anyone who wants the oversized look go one size up on purpose. What you want to avoid is the whole order drifting large because everyone "played it safe," leaving your smaller leavers swamped. Make it clear in your size collection that ordering up is optional, and that the size chart reflects a normal fit.
Running a group size collection without the headache
This is the part that trips reps up. A few habits make it painless:
Collect sizes with a form, not a group chat. Sizes buried in a hundred messages get lost. Use a simple form or spreadsheet with one row per leaver: name, size, and — if you're personalising — their name or nickname and any number. Our guide to placing your leavers order shows what details to gather.
Put the size chart in front of people before they choose. Half of the wrong sizes come from people guessing. Share the actual chart, plus the "measure a hoodie you own" tip, when you ask for sizes.
Offer a size set or samples if you can. For big orders, seeing and trying the actual hoodie removes most of the doubt. Ask us whether a size set makes sense for your group.
Set a hard deadline and confirm back. Give one clear cut-off date, then send each leaver their recorded size to check before the order is placed. A 24-hour "reply if this is wrong" window catches mistakes while they're still fixable.
Order a couple of spares. A small handful of extra hoodies in your most common sizes covers late joiners and the inevitable "can I change mine?" It's cheaper than a reprint.
Common sizing mistakes to avoid
Ordering everything a size up "to be safe" — you end up with a baggy year group and unhappy smaller leavers. Mixing youth and adult labels in the same list without noting which is which. Forgetting that a zip-up and a pullover can fit slightly differently. Leaving size collection to the last week, when there's no time to correct errors. And relying on memory or a chat thread instead of a written list you can check.
Frequently asked questions
What if someone is between two sizes?
Go by the chest measurement first. If they're right on the line and want a roomier fit, the larger size is the safer call for a hoodie — but only if that's the look they want.
Can we mix youth and adult sizes in one order?
Yes. Plenty of groups do, especially at the younger end. Just label each leaver clearly so youth and adult sizes don't get muddled.
How much room should a leavers hoodie have?
Enough to layer comfortably over normal clothes without being baggy. Hoodies are cut with some room already, so you don't need to size up for comfort alone.
What's the safest way to avoid fit complaints?
Share the size chart up front, collect sizes on a written form, confirm each person's size back to them, and order a few spares in popular sizes.
Can you help us collect sizes?
Yes — we help year groups run their size collection all the time. Tell us your numbers and we'll point you at the easiest way to gather sizes and names.
Get your leavers hoodies sized and sorted
Sizing doesn't have to be the stressful part. With the right chart, a written size collection and a clear deadline, your whole year group ends up in hoodies that fit and photograph brilliantly on leavers' day. When you're ready, sort your Class of 2026 leavers hoodies with us — send us your numbers and your leavers' event date and we'll help you get every size right.
