The material feels great on the skin and I love the built in bra.  I purchased a size M and it fits, but if doing alot of flowing in the yoga class or bending, the shirt rides up in the back.  Not sure if that means get a bigger size(but then the bust could be loose) or maybe that''s the downfall of the material?  I''m saying in my review that it feel true to size, but if I were to gain even five pounds, it would be too small.