I am 5'7"; 128 lbs. I have been buying the boyshorts for years in a size 6. A few months ago, I chose to ignore the other reviewers who said to buy a size up and bought 6 pair of the size 6. They were tiny and would have fit my 5 year old niece. I sent them back and waited quite a while for the refund. I then ordered 6 pair in the size 7. When I received them, I tried one pair on and the sizing wasn't great, but they were wearable. I then put the other pairs in my closet and spent a couple of months out of town. When I returned, I tried to wear another of the pairs I had ordered and they were at least a size smaller than the first pair I tried on. It's truly a shame because now I cannot return them and have no idea where to buy similar, correctly sized underwear. In a fashion world where everything is vanity-sized (I know I should not be fitting into a size 0, nor should such size even exist) that these are so, so small (unless I am missing something and some women actually WANT to feel they have large bottoms and waists?). Beware! If you DO choose to order these, order at least two sizes up. And try them all on before deciding whether they are okay or not as the sizes within the marked size vary!