I was about 385 and a size 32. I lost about 75 lbs before I had to buy new clothes, in about 2 months. and the next size I got was a 24. It seems like once you get into more of the "normal" range of 18/20, a size changes every 10-15 lbs. Today, I am 135, lost 250 lbs and wear a size 8-10. Pretty awesome. :) I never even have to try anything on. But, I can definitely feel the change wuickly if I go up or down just a few pounds. When I was bigger, I could have gone up or down 30 lbs and not even noticed.