I have big hips/butt, I bought size medium for the beginning of pregnancy when I was around 160lbs and they still fit me at 9 months at almost 200lbs. Im also 55 and they covered my ankles. I still bought a size large as well though, just to have two pairs cuz I loved them so much. They both fit, I was just able to tuck the size large under my maternity bra better. These are pretty much all I wore out my whole pregnancy. I even wore them at work with regular shirts since they weren't even see through. I did the bend over test in mirror and had multiple people check for me, nothing and Im a wide girl! Also, great for under short dress too!