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This is poorly made. One sleeve is about 3 inches above the wrist and the other is full length. It is thin material. I ordered a 1x to have it fit loose and it's shaped very oddly - overly large and stretched out around the bottom hem area and fits like a large around the bust (I usually wear a large). Maybe this is a one off.
For a brand called Just My Size, they sure do miss the mark on sizing. I think this every time I order something from them and yet, it's a shock each time. I was looking for long sleeve shirts to wear while i'm working from home (2020 has been the year of the athleisure clothing investment). I like my tee-shirts roomy and soft. This missed the mark on both counts.
My advice - size up, if you like things roomy, order two sizes up. In most brands a 1x is very comfortable for me. I ordered a 2x because I remembered my issue with this brand and it fit - it just didn't feel comfortable and snuggy. The cotton was still pretty hard. I'm pretty sure with time and repeated washings, this would have gotten softer, but I don't have that time to invest in a shirt that's already making me feel bad about myself by forcing me to order a size up.