Sezane’s classic French sizing 38, armpit to armpit measure 19.5, I’m usually a size 2 and Xs/S - this one gives me room to move around without feeling constrained. In excellent condition!! Easy to dress up or down, transfer from work to date to play. Comes with a free Sezane tote bag if you buy it full price or pick up another item in my closet. Note that the cover picture is showing the fit of the blazer and not the actual blazer itself. The fabric of the one for sale is a refined wool in navy.