YAY! I too had some pants that I'd have to lay down on the bed and blow every ounce of air out of me I could and suck in my gut as far as I could and I could just barely zip them up- and now! they zip up with me sucking it in even I love it! good for you girl!
Congratulations! I just had a similar experience with some shirts. Personally I find things like that to be even a bigger motivator than seeing pounds drop off the scale.