These are so comfy- I literally can't put them on if I have to be somewhere because I just won't take them off. They are very generously sized. I wear XL in normal clothing- I'm short & round, and I chose M. I think a S would have been a little better because I have to roll up the cuffs at the ankles. I will absolutely be purchasing another pair. They are soft, cozy, comfy- everything I had hoped they would be.

One note- the butt flap is just a little bit awkward to manage, because of how loose these fit (it's hard to get traction to pull the zippers), so if you have limited flexibility in your shoulders, or if you have a lot of weakness, you may find that to be a challenge. I still think they would be great, because the front zips are very easy to use, so don't let that deter you.