Being a child of the 80s and 90s, I used to wear string bikinis on the regular. Then they seemed to disappear (why?!), so I have suffered through various types of undies for 20 years. I found these and got them on a whim- and love them so much, I have ordered more! The organic cotton sis slightly sheer and ridiculously soft. It feels like I am not wearing anything, but in the best possible way. they have washed well so far (delicate in a bag in the wash and hang dry). I got the size medium, although I may buy a small to compare. I figure I will be in between sizes, but Medium is great (I am 5'9" and 137lbs but have some junk in the trunk from years of ballet and running) I typically wear a size 25/26 or 2/4 pants. I like the coverage of the medium (not crack shows, and the side strings don't dig at all). so happy to have found these!!