Custom Shirt Size Chart Guide: Adult and Youth Sizing Explained
Quick Answer- Adult unisex shirt sizing typically runs Small through 3XL or larger depending on the specific style.
- Youth shirt sizing is measured by age, not the adult scale, and runs roughly XS through XL across ages 4-18.
- Fit runs true to size for most adult buyers, with some choosing one size up for a looser look.
- Single-piece ordering means a sizing mistake costs one shirt, not a case of unsold inventory.
Custom shirt sizing questions come up constantly before a first order, and for good reason: unlike buying an in-stock shirt off a shelf, a custom order commits to a size before anyone has tried it on. Here is the working size chart guide covering both adult and youth sizing so an order comes back fitting the way it was meant to the first time.
Adult Unisex Custom Shirt Sizing
Most unisex tees, hoodies, and crewnecks in a custom apparel catalog run on a single scale from small through 3XL or larger depending on the specific style. Fit runs true to size for most adult buyers, meaning someone who wears a medium in typical retail brands usually wears a medium here as well. Buyers who prefer a looser, oversized look often size up one from their usual.
Youth Custom Shirt Sizing by Age
| Youth size | Approximate age |
|---|
| XS | 4-5 years |
| S | 6-7 years |
| M | 8-10 years |
| L | 12-14 years |
| XL | 16-18 years |
These are approximate ranges rather than exact fits. For a group order (a youth sports team or a family reunion order, for example), confirming with parents by size rather than assuming by age alone avoids most reorders.
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How to Read a Custom Shirt Size Chart Without Getting It Wrong
- Check unisex vs women's specific cuts. A women's cut tee runs narrower through the body than the unisex version in the same labeled size.
- Check the specific product, not just the brand. Sizing can shift slightly between a brand's tee and the same brand's hoodie.
- When between two sizes, consider the intended fit. Size down for a fitted look, size up for a relaxed or oversized look.
- For groups, order one sample size first. Confirm the actual fit on one piece before finalizing a size breakdown for a whole team or group.
Why a Sizing Mistake Costs Less With Single-Piece Ordering
A traditional bulk order requires committing to a size breakdown (how many smalls, mediums, larges) before anyone has confirmed fit. Get that ratio wrong and mediums sell out while larges sit unsold. With single-piece, no-minimum ordering, each customer or team member orders their own exact size with no group commitment required upfront. See the measuring guide for how to get the exact size right on the first order.
Order the Right Size the First Time
Adult and youth sizing on every product page. Order one, check the fit, then scale up.
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Frequently Asked Questions
What is the standard adult shirt size range?
Most unisex styles run small through 3XL, with some pieces extending further depending on the specific garment.
How does youth sizing map to age?
Roughly XS for ages 4-5, S for 6-7, M for 8-10, L for 12-14, and XL for 16-18, though actual fit varies by individual child.
Do custom shirts run true to size?
Most unisex styles run true to size for typical adult body types. Buyers who want an oversized or relaxed fit commonly size up by one.
Can I order different sizes for different people in one order?
Yes. With single-piece printing, each person orders their own size directly, removing the need to guess a size breakdown in advance.
Cameron WellsCustom Apparel and POD Industry Writer
Cameron has been writing about the custom apparel and print on demand industry for seven years, with a background in e-commerce operations. He covers platform comparisons, no-minimum vendors, and what is changing for small custom merch businesses.
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