Poast moar pics and we can help, or maybe some of us can.
Could be the style you wear, but most likely is you're either going too tight hoping you'll magically fit, or too loose hoping to hide something. The first makes you look too fat for your clothes, the second makes you look like a walking tent. (When I say you, i mean anyone).
Clothes that fit well is a starting point. Flattering style is step 2. If you're still not happy, weight loss is probably step 3.
Anyway if you want feedback, post some body shots.
Is that for real? I didn't know that was possible. Unless it's like a fat roll graphic T-Shirt. Which might be amazing. Could that be camouflage for perverted guys? But it might be your imagination, unless you're wearing one of those Victorian hip+butt dresses. Those made women look fat.