I love these "leggings" and the fit is perfect for me.  I'm 5'8" and weigh 172.  The Large size (18/20) fit me at the waist, and are slightly loose all over.  The length (about 30") is great with flats or laced sports shoes.  I wear these with shirts, tunics and tee shirts.  I've bought 10 pair for a month abroad, as they're light weight (but not flimsy), pack like a dream, and don't wrinkle.