I love this brand name and have tried with these fasteners--I'M GETTING USED TO THE FASTENERS! I just had the Carhartt Women's Denim Bib Overall delivered to me in like 2 days!!  and the fit? perfect. I normally am in a 13 (I gained weight and cant get my regular jeans on but am dieting).  with these the size medium is a 8-10 and I have never been so in love and comfy with these on!!!  go down a size although I haven't put them in the dryer get, but I don't want anything too baggy so I went down a size.  you will LOVE these!  I bought 5 pairs of the knee length ones last year . try getting them now? cant!  that's why I bought 5 pairs I just knew I wouldn't get them again when I wanted them.  ok, so I just ordered 4 more of these with a total of 8.  I need them, have a barn and horse out back--thank you!