I am 5 ft 5 inches. My weight is 134. I got this in a M. Under arms too big, but length is perfect. I love the feel so much. I am going to try to take it in a little under the arms so my bra does not show. I got this is black and it's a perfect fit, but a size 6. Thelegnth is quite as long, but I like the longer length. I usually wear a 8-10 which would be the M. I bought in both sizes to see which was a better fit. Very classy., very nice, ,awesome!