I could tell a bit by the fit of my clothes, but the absolute kicker for me was the first time that I could by a pair of pants from Old Navy! Like a dream come true
(when I started my 'diet' I was a pant size of 26, now I am a 20).
Now of course they have the larger sizes, so it isn't that big of a deal...but that first time that I could walk into that store and put on a pair of pants was like heaven. Now if I could just fit into the tops (boobs too big). But hey, I have a stylish bottom! hehehe