If that works for you, go for it. Just don't spend too much and buy just ONE thing so if the experiment doesn't work like you thought, it's not a huge waste.
That wouldn't work for me though. If I'm going to shop, I rather buy a cute thing that fits me NOW so I can enjoy myself throughout the process. I have to drop 100 lbs -- my process is going to be a long journey!
But... different strokes for different folks.
GL!
A.