Ah, the suit. It is one of man's greatest inventions, right up there with the automobile and the urinal. When it comes to looking good it is second to none. It can make anyone look like a lord, a duke, a king, or even Neil Patrick Harris. If you don't have one I recommend you go to your nearest vintage or thrift shop and find one that fits. And if it almost fits, then have it tailored. There are several articles online to know when you need to tailor your suit but I find that esquire has a good, simple list. You are welcome to search further into the matter, but honestly, unless you plan on doing it yourself, just find a good tailor near you and have them measure you. They can make you look good.
Now there are several types of suits out there and honestly I don't plan to go into any detail about them at this point in time, but there are a few things I can say now. Triple Button suit jackets and higher look fantastic on those of us with absolutely no weight on us whatsoever. They can be good at concealing weight but for those of you with a little bit more girth it would be best to consider a two button jacket. Three Piece Suits- Always awesome. Especially now. You'll see more and more of the indie singers wearing vests and three piece suits in their videos and on the stage. Keep in mind that a three piece will always look a little bit more formal than your standard 2 piece. When getting dressed for school that is always a concern of mine. I wouldn't want to appear pretentious after all (that's a lie). Double breasted suits look great on larger men as well. I think I look silly in them. But there are always exceptions to the rule so if you see one you like then try it on, decide if it's worth getting tailored, and enjoy. You'll look dapper as hell.