I am 120-125 pre-pregnancy and normally wear a 6. I got a medium and it fits well. I also carry more weight in my thighs than most people my size. The pants are definitely relaxed, a little wide all the way down, but it helps de-emphasize your thighs and hips. I like the pants a lot.
Comfortable, lightweight, and easy to launder and wear. Fit's true to size. Nice styling if you like slightly wider straight legged pants (as I do). A little long for me (I'm 5'3"), even with some heels, but that's an easy fix.