I purchased a S and M in both gray and navy/dark blue. I was surprised the small was a little larger on me so the medium was of course loose fitting. I reached out to Aiyino to see if by chance I could return for XS. Their customer service is second to none. Extremely responsive, easy to work with and resolved my questions quickly. The shirt itself is a nice shirt - very comfortable fabric. Will certainly look into buying more from Aiyino.
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