Where can a heavier guy get fashionable clothes?

I am a heavier guy. I want to find some fashionable clothes but it seems that the mall stores that I used to shop in only carry pant sizes up to a 38 and XL in shirts. I currently wear a 2xl and size 42 pants. I dont think that I look like the stay puff marshmellow man or anything...I have just gained some weight. I am back on the diet deal so I can get back to my large sized shirts and 36-38 inch waist. I am a young guy (27 years) and hate feeling that I have to be rolling around in unappealing frumpy-fat people clothes. Where can I find some fashionable clothes that wont make me feel more depressed then I am now??