Because of reviews, I originally ordered a 2X, although my regular size is a Large. It was much too big. That was returned for an XL. The XL is a little too big wear the elastic holds onto the arms. Fortunately, I can sew so I’ll take it up. The quality is fantastic, and the look is beautiful. I believe it’s true to size if you have small boobs (I would have been fine with my usual large). HOWEVER, if you have large breasts, you absolutely must size up. Depending on the bra, I wear 34/36 A or B. I’m 5’10” 143lbs.