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I am 5'8, 155 lbs. and I bought size Medium and they are really tight. They are uncomfortable on the sides where the seam is and on the top where the waistband is. They dig into my skin until its so painful I have to change out of them. If I were to repurchase, I would but the Large or even XL.
Since I have to wear my briefs with a cotton crotch these days, I bought a pair of these. The size med.was surprisingly smaller than I expected and had a difficult time getting a pair on. Also the lace material is very stiff. The crotch was made with a material that at best I can describe as tightly woven gauze lined with nylon. I had to cut out the nylon layer so the crotch would really be 'breathable". This will do in a pinch until I can find another tummy control brief with a cotton crotch that is not stiff.