I tried to go by the reviews & the sizing guide.  I really like the cut of this and it's coverage.  I am 5'7" and weight 159 lbs.  I know everyone said to size up, my problem is that I recently had a mastectomy and trying to find something that won't be overly blousey in the breast area. I ended up buying a small.  It is super snug on me!! However, it fits my 13 yr. old daughter who is 5'2" & 110lbs. really well. So, I'm going to keep this one and get another size for myself. It really does have nice shape to it and hope by simply going up to a medium with be enough of a jump.  If not I'll keep trying until I get the right size. I think it's worth the effort.