Well yes I have in the past. It never worked for me, but then I never knew how to lose weight before. I tried so many diets, and stuck to them, they just didn't work.
This time I have lost 2 stones by having a low carb diet, making sure I eat enough protein and fats so that I am not hungry. I have also had tremendous support from the folks on this forum and this has made all the difference.
I've never bought clothes specifically as an incentive, but I used to keep favourite clothes that were way too small hoping I'd get back into them some day. Never worked though
I have a dress I wore 10 yrs ago, determined to get back into it, I know I wont but the fabric is gorgeous. Erm if anyone needs a little bag to go with 'the little black dress' I make them. LOL Sorry for the sales pitch.