Originally Posted by PaoloM
A DB suit should always have pleats, and never belt loops, that will avoid it looking like a fashion piece.
I disagree with this, I think. In your 20s, there's always a danger that a DB suit will look dowdy, or like costume. The OP wants a suit to go out in so, presumably, part of its purpose is to get him laid. Pleats and braces aren't going to do this, unless he is very charismatic in a very eccentric sort of way. I agree with Landshark that he should find something relatively modern; and I don't mean something shiny or ridiculously short, just slim fitting
I'm 20 so probably a fair bit younger, but if I were to have one suit to wear out at night it would be solid navy blue, SB, 2 button, with flat front trousers. I'd only consider DB for this kind of thing if I could go bespoke and get something that looked really, really suave.