The 10/10 Boys Sizing Guide: How Each Piece Fits (So You Nail Your Size)
Last updated: 2 September 2026
Buying streetwear online shouldn’t feel like a guess. The 10/10 Boys Sizing Guide exists to make sizing simple: how each piece fits, what measurements matter, and which size to choose depending on whether you want a clean fit, a relaxed streetwear fit, or a true oversized silhouette. And because fit is part of long-term satisfaction, this guide connects directly to The 10/10 Boys Quality—the same standards that define fabric, construction, and durability also influence how a garment drapes and holds its shape over time.
Quick answer: pick the fit you want first—clean, relaxed or oversized. Then take a piece you already wear happily, lay it flat and measure it. Compare those numbers against the chart below for the same type of garment, and check the product page for piece-specific exceptions before you order.
Start with your fit goal first
Most sizing “mistakes” happen because people choose a size before choosing a silhouette. The 10/10 Boys Sizing Guide works best when you pick your look first.
The three fit styles most people want
- True-to-size (clean fit): balanced, sharp, and easy to style.
- Relaxed (everyday streetwear): more room through chest and sleeves for comfort.
- Oversized (statement fit): wider body, dropped shoulders, and extra volume.
These are silhouettes, not sizes. A piece that is already cut oversized reaches that look at your usual size, while a regular-cut piece needs a different size to get there. That is why the piece matters as much as the number on the label.
Measure once, buy smarter every time
This is one of the easiest ways to use The 10/10 Boys Sizing Guide with confidence, especially if you already know how your favourite tee or hoodie fits. That’s also a big part of The 10/10 Boys Quality experience—consistent patterns and intentional cuts start with accurate measurement.
One thing to know before you compare anything: every chart published by The 10/10 Boys—the ones below and the ones on product pages—is a garment measurement taken with the piece laid flat, not a measurement of your body.
The only measurements that really matter
Two different kinds of number get mixed up here more than any other, and it is the most common reason an order arrives in the wrong size:
- A body measurement goes around you. Your chest measurement is a circumference.
- A garment measurement is taken on the garment itself, laid flat on a surface.
- Width (tees) and Chest width (hoodies) are flat widths: the distance straight across the chest, seam to seam, on one side of the garment only.
- A flat width is therefore not a circumference. Don’t double your own chest measurement and compare the result to those columns—you’ll be comparing two different things and sizing up too far.
The reliable method is to compare like with like. Lay a tee or hoodie you already wear happily flat, then measure:
- Chest, flat: straight across from armpit seam to armpit seam—compare this directly with Width or Chest width
- Shoulders: seam to seam across the back
- Body length: top of shoulder to hem
- Sleeve length: shoulder seam to cuff
If a garment you already love matches a column closely, that size will fit you the same way. Same method, same kind of number, no guesswork.
10/10 Boys size charts
These are the measurements published on the product pages themselves, in centimetres, taken with the garment laid flat. Each chart covers the pieces named above it—don’t read one chart across a whole category.
T-shirt measurements
Applies to T-SHIRT GOLD and the three LA to the ends tees (green, blue and pink). All four share the same pattern and sell in S to 3XL.
| Size | Length (cm) | Width (cm) | Sleeve length (cm) | Sleeve cuff (cm) |
|---|---|---|---|---|
| S | 71.5 | 53 | 20 | 17 |
| M | 73.5 | 55 | 21 | 18 |
| L | 75.5 | 57 | 22 | 19 |
| XL | 77.5 | 59 | 23 | 20 |
| 2XL | 79.5 | 61 | 24 | 21 |
| 3XL | 81.5 | 63 | 25 | 22 |
Hoodie measurements
Applies to Hoody – Only the best, HOODIE – LOS ANGELES and HOODIE CLASSIC LOOSE. All three publish the same chart. Two things worth knowing before you order: Hoody – Only the best lists its largest size as XXL rather than 2XL, and HOODIE CLASSIC LOOSE also sells a 3XL that the published chart doesn’t cover.
| Size | Length (cm) | Chest width (cm) | Bottom hem (cm) | Sleeve length (cm) | Sleeve cuff (cm) |
|---|---|---|---|---|---|
| S | 70 | 51.5 | 45 | 61 | 9.5 |
| M | 72.5 | 54 | 47.5 | 62.5 | 10 |
| L | 75 | 56.5 | 50 | 64 | 10.5 |
| XL | 77.5 | 59 | 52.5 | 65.5 | 11 |
| 2XL | 80 | 61.5 | 55 | 67 | 11.5 |
Jogger measurements
Applies to Joggers – Only the best, which sells in S to XXL. Waist is measured relaxed, with the elastic unstretched.
| Size | Waist, relaxed (cm) | Hip (cm) | Inseam (cm) | Outseam (cm) | Leg opening (cm) |
|---|---|---|---|---|---|
| S | 36 | 52 | 72 | 100 | 12 |
| M | 38 | 54 | 73 | 102 | 12.5 |
| L | 40 | 56 | 74 | 104 | 13 |
| XL | 42 | 58 | 75 | 106 | 13.5 |
| XXL | 44 | 60 | 76 | 108 | 14 |
Not every piece publishes a full measurement table yet. The OG T-shirt, the OG Hoody, the long sleeve shirts, the crop tops, the denim skirt and the accessories don’t carry one, so check the individual product page for the piece you’re buying and use a garment you already own as your reference.
How each piece fits
This is the core of The 10/10 Boys Sizing Guide—how each piece fits and how to choose your size based on the silhouette you want.
T-shirts: structured drape, clean shoulder line
Fit is not uniform across the T-shirt range, so the piece matters more than the category:
- LA to the ends tees and T-SHIRT GOLD: cut oversized in 220 gsm cotton, and the only tees that publish measurements. Size by the chart above—your usual size gives you the oversized cut as designed, and one size up adds body and sleeve room if you want more drop.
- OG T-shirt: a relaxed everyday fit, S to 3XL. No chart published yet, so measure a tee you already wear and work from that.
- Long sleeve shirts: the clear exception. They’re designed to be worn oversized, and their product pages recommend ordering one size up.
For a deeper breakdown of proportions, sleeve shape, and how to style looser tops, read our oversized T-shirt fit guide before choosing your size.
Fit check: the shoulder seam is the tell. If it drops past your shoulder bone, you’re in oversized territory.
Hoodies: built for comfort, shape, and layering
There are four hoodies in the range, and they don’t all behave the same way:
- HOODIE CLASSIC LOOSE is already cut loose. If a relaxed silhouette is what you want, this is the simpler starting point—take your usual size rather than sizing up on something else.
- Hoody – Only the best, HOODIE – LOS ANGELES and the OG Hoody are regular-fit pieces. Your usual size gives you the classic hoodie fit.
- Sizing up on a regular-fit hoodie does add room, but it adds it through the sleeves as well as the body. Compare the chart above against a hoodie you already wear before you decide.
If you’re comparing silhouettes, warmth, or layering options, our hoodie guide can help you choose the right one first.
Fit check: if the hem feels tight on the hips or the body rides up when you move your arms, size up.
Joggers: comfort with silhouette control
How it fits: the waist is designed for comfort; the leg shape depends on the cut and fabric.
- True-to-size: best for a clean silhouette and reliable waist fit
- Relaxed: size up one for more thigh room and a looser stack
- Very oversized: size up only if you want maximum volume—otherwise keep waist true and choose a straighter cut
Inseam and leg opening decide how the hem stacks over your trainers, and both move together as you size up. If you want that part right before you order, our guide to how streetwear joggers should fit covers waist, rise, thigh and cuff one at a time.
Fit check: if sitting feels restrictive at the rise or thigh, sizing up usually solves it.
Caps and hats: depth and adjustability
No 10/10 hat carries a size option, but they don’t all fit the same way. The snapbacks and the trucker caps close with an adjustable snap at the back, so one hat covers a range of head sizes. The beanie has no closure at all—it’s a ribbed knit that stretches to fit. Crown depth is the other variable: if a cap perches high, you likely need more depth; if it rides too low, a shallower crown will sit better.
If you’re deciding between the two shapes rather than the size, our snapback versus beanie breakdown covers how each one wears.
If you’re between sizes, use these rules
This is the most practical section of The 10/10 Boys Sizing Guide—what to do when you’re unsure.
The simple between-size decision
- Want a clean fit? choose the smaller size
- Want a streetwear fit? choose the larger size
Tall build
Prioritise length (body and sleeve). If tees and hoodies often feel short, sizing up can help.
Broad shoulders and chest
Prioritise shoulder width and chest room. If seams feel tight or the chest pulls, size up for the intended drape.
The 60-second “try-on” checklist
When your order arrives, use this checklist from The 10/10 Boys Sizing Guide:
- Shoulder seams sit where you want (standard or dropped)
- Chest feels comfortable with no pulling
- Body length matches your preferred silhouette
- Sleeves hang cleanly and don’t twist
- Movement feels easy (raise arms, sit, bend)
If everything checks out, you nailed your fit.
The quick sizing shortcut
If you want the safest choice:
- Tee: size by the chart—the LA to the ends and gold tees are already cut oversized at your usual size
- Long sleeve shirt: order one size up, as the product page recommends
- Hoodie: true-to-size on the regular-fit pieces; take CLASSIC LOOSE if you want the relaxed cut
- Bottoms: true-to-size for waist, size up for looser thigh/stack
- Hats: one size—adjustable on the caps, stretch on the beanie
FAQs About 10/10 Boys Sizing
Do the T-shirts run true to size?
It depends on the piece, so check the product page before you order. The LA to the ends tees and T-SHIRT GOLD are cut oversized and publish a full measurement table, so you can size by the numbers rather than by feel. The OG T-shirt sits in a relaxed everyday fit, and the long sleeve shirts are designed to be worn oversized—their product pages recommend ordering one size up.
Should I size up for an oversized hoodie fit?
Not necessarily. HOODIE CLASSIC LOOSE is already cut loose, so it’s the simpler starting point if a relaxed silhouette is what you’re after. On a regular-fit hoodie, sizing up does add room—but through the sleeves as well as the body, so compare the published measurements against a hoodie you already wear before you commit.
How do I choose the right jogger size?
Start true to size at the waist. Joggers – Only the best runs S to XXL and publishes waist, hip, inseam, outseam and leg opening, so you can check those figures against a pair you already wear. Size up if you want a looser thigh or more length stacking over the shoe.
Are the hats one size?
Yes—no 10/10 hat carries a size option. The snapbacks and the trucker caps close with an adjustable snap at the back, which covers a range of head sizes. The beanie is the exception to the closure: it has none, and relies on the stretch of the ribbed knit instead.
Wear the fit, not the doubt
The best-looking streetwear fits are intentional. The 10/10 Boys Sizing Guide is built to help you choose a size that matches your style, while The 10/10 Boys Quality ensures the piece keeps its structure, drape, and presence over time. Pick your fit goal, compare measurements once, and you’ll know your size with confidence—drop after drop.