I bought the xsmall, as suggested by the sizing chart. I can tell you that it fits perfectly, not too tight and not too loose. If you ladies want something snug, either buy a size smaller or find another product. Not the cutest scrub top out there, but it beats wearing a rectangle with sleeves. Fabric is thicker (65% polyester/35% cotton) than I thought and didn't soften up after one wash either. But no complaints for this product.