Guys, tell your girlfriend, your sister, your Mom or just buy them a pair.  If they're tired of wearing womens froo-froo flimsy sweats around the house....GET THESE.
I'm a size 6.  I bought a mens small.  They fit great. A small would fit a size 8 iust as well.  They're warm, thick with a strong elastic waist a tie string.  The crotch is a little low, but I love that..it's comfy. I found  that womens sweats are, at the very best, double stitched around the waist.  These are triple stitched.  I don't have to worry about them falling off if the tie comes undone, or losing the tie in the waistband or having the waistband stretch to the point I have to poke holes in the sweats and run a shoelace through. I will never buy  a pair of womens sweats again.