I usually wear a small but tend to size up for a more relaxed fit. I purchased this shirt in a medium because I hate tight fitting tshirts, but this shirt already runs a big oversized so order true to size. It's great quality and super flattering. I threw it in the wash for a true test of the quality before I wrote this review and it came out looking just like it did before I threw it in. I already have grey, white and black waiting in my cart for my next purchase.