Glenn and Coco Long Sleeve T-Shirt by Katie Van Slyke®

A quick guide to long sleeve sizing so you can pick the right fit on the first try. All measurements are in inches and reflect the actual garment laid flat, not your body — so if you're comparing to a long sleeve you already love, measure that one and match it to the chart.

Long sleeves run true to size for most fans. If you're between sizes or want a more relaxed fit over a hoodie or thermal, size up. If you like a closer, more fitted feel, stay with your usual size.

Long Sleeve T-Shirt Size Chart

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 nail your size: grab a long sleeve tee you already wear and love. 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 your size.