I fluctuate between135 to 140lbs. Height-5'4 Bust-37 inch, Waist-36.5 inch, Hips-42 inch. Bought the medium. I love the stretch with my shape body & adjustments I can make at crotch area. Love the comfort on my shoulders!! Very important to me, as I have chronic shoulder & neck strain. Most bras cause me a great deal of suffering from the moment I wear them. This is a lightweight body shapener. Exactly all I need as I'm aging in my late 40s. It is my first full body suite for this purpose & paricular dress. It is pretty too. Far more comfortable than any bra & tummy control underwear. I am very comfortable with my weight & body type/shape, but starting to loose muscle tone at my belly, hips, thighs, buttocks. However, the dress is not form fitting so I do not need a shapener for hips or buttocks. This body shapner comfortably & lightly makes my belly & waistline look/feel more flattering & provides just the right amount of support for my breasts. It does not shape the buttocks or thighs, but it doesn't cut in either. With my uneven curves, I felt a large would not help shapen me, so went for the medium. I'm glad I did, tho it flattens my C almost D cup breasts just a bit, however, the dress I bought this for is modest for my daughter's wedding & I don't mind that at all. Not trying to pick up a one night stand flaunting my breasts at my daughter's wedding. There is breast support, but NO breast lift or boost up if you want/need that. Can still wear a bra underneath if you need. Dress has not arrived yet, but I'll edit this with a before & after when dress comes. I like the comfort with a bonus of a slightly flattering shape this suit gives. Was just what I needed with my curves & less firm muscle/tone & with the dress I'm waiting on. I'm very happy with the quick shipment, arrived in 3 days. Very happy with the price tag. Love the soft silky fabric on my skin. Super happy no part of it cuts into my skin back, front, hips, breasts or butt. Exceeded my expectations that it does not add further pain to the daily chronic pain I live with. I know when I need to wear this all day at my daughter's wedding, I won't suffer in addition because of this body suit. Updates coming soon as dress arrives.