A quick guide to youth long sleeve sizing so you can pick the right fit for your little farm fan on the first try. All measurements are in inches and reflect the actual garment laid flat, not your kid's body.

Youth long sleeves run true to size for most kids. If they're between sizes, growing fast, or you want a couple of seasons out of it, size up. If your kiddo likes a closer fit, stick with their usual size.

Youth Long Sleeve T-Shirt Size Chart

Size	Width (in)	Length (in)	Sleeve, center back (in)
S	16	21.5	26.5
M	17	23	27.5
L	18	23	28.5
XL	19.5	27	30

How to Read the Chart

Three quick measurements and you're set:

• Width is measured pit to pit (across the chest), laid flat.
• Length runs from the top of the shoulder seam down to the bottom hem.
• Sleeve, center back is measured from the center of the back collar, out across the shoulder, and down to the cuff.

The easiest way to find the right size: grab a long sleeve your kid already wears and loves. Lay it flat. Measure the width pit to pit, the length top to bottom, and compare to the numbers above. Whichever row matches closest is the size to grab.

Frequently Asked Questions

Do Katie Van Slyke youth long sleeves run true to size?

For most kids, yes. The cut is relaxed but not boxy, with a slightly longer body for layering and play. If your child wears a Medium in everyday long sleeve tees, a Medium here should fit right.

How do youth long sleeves compare to youth tees?

Youth long sleeves and youth tees share the same body width measurements, but long sleeve bodies run a bit longer for that full-coverage, layer-ready fit. If your kid has sized into our kids' tees before, the same size will work here.

Should I size up so they can grow into it?

If you want two seasons out of it, yes — sizing up one is a safe move. The fit will be a little roomy at first but they'll grow into it without it ever feeling too small. If you want the right fit now, stick with their usual size.

How should I wash to keep the fit and print looking good?

Wash cold, inside out, tumble dry low. Skip the bleach and the fabric softener. That'll keep the print bright and the fit on lock through plenty of playground, barn, and school wears.

Where can I find the adult long sleeve sizing chart?

Right here — check out the adult long sleeve sizing chart for sizes S through 5XL.

Shop the Youth Lineup

Browse the full kids' collection for long sleeves, tees, hoodies, and more — or check the onesies for the littlest farm fans.

Looking for matching family fits? Head back to all apparel for adult styles in the same designs.