I'm trying to think but it's so much easier to dress overweight girls slimmer than it is to dress overweight guys slimmer. How much do you weigh? In stones (not pounds)?
Basically with women it's all about the hourglass shape and with guys it's always about the V shape, so perhaps clothes that broaden your shoulders to balance out your body. When I was a school there was a teacher that the girls swooned for, he wasn't particularly hot but he was quite charismatic, he was overweight but in a suit, with the suit jacket on (broadening the shoulders), he looked good, it really suited him.
I think it also depends on your face shape, one of my friends has a really round face and chubby cheeks but her body is really slim. But you still don't think of her as skinny because of her face. The teacher I mentioned didn't have too much weight around his face, so he didn't seem as overweight as he was, especially with his suit on.