I'm wearing a size XL shirt and it's "comfortable" for me. I followed their schedule and bought the XL. It's VERY tight for me. I returned it and bought a 2XL and it fits comfortably and loosely. After all, returns are free if the size is wrong. The tag on the shirt says 97% cotton and 3% spandex. The material of the shirt is VERY stretchy. Feels more like 97% spandex and 3% cotton, but I'm not an expert on fabrics. Perhaps elasticity is working in your favor?
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