@ 170 pounds ... Chest 40" (36D Bra Size) ... Waist 34" ... Five foot Five and a half inches tall, Size L fit properly around bust line and sleeves are long enough to come to my wrist. It is a very beautifully and well made blouse 97% Polyester 3% Spandex. There isn't any stretch to it. Has 2 cloth covered, tiny round buttons on each end of the sleeve (cuff) and 2 at the back of the neck with elastic loop to go around buttons. As described feel very comfortable, well dressed and elegant in this blouse. Recommend.Tried size M but the sleeves came down to about 3/4 (arms). Bust-line was snug felt like it would split if I moved my arms up & elbows back. Side tag says Machine wash Do not tumble dry and Do not dry clean.