I am 5'2", 120-125 lbs, and wear size 6 jeans, so size small would typically fit.  But with these drapey skirts, I was worried about them clinging to and accentuating my thigh bulges.  So, I ended up getting medium.  Thigh-wise, medium was a good choice.  Since I'm short, I wear it pulled up to my waist and rolled over all the way.  The length is good. But, it fits a bit loose around the waist area, and if I lose a few pounds, it could slip down and be too large.  So I think a small would have fit satisfactorily as well.

I chose the dark chevron print (I think my review will give the actual color name, but I can't remember what it was called).  It's very pretty, and is not see-through.  The material is thin, smooth, has a beautiful drape and movement. I had a similar long, casual, easy skirt last summer and wore the heck out of it, so I'm glad to have another option in my closet.