I bought this as a gift for our very petite coach. I ended up getting her a medium after talking to others who had bought similar "dry shirts." I'm glad I did, as the medium fits her well. She's probably a size 3 or 5 regularly. These shirts don't stretch, so keep that in mind when ordering. The quality is nice. We had ours embroidered by a local shop, and it took the embroidery well.