A beige bomber jacket and blue chinos are among the crucial elements in any gent's functional casual closet. Rounding off with derby shoes is a fail-safe way to add a little fanciness to this ensemble. Keep this combination in your front hall closet come warmer weather, and we guarantee you'll save a lot of time getting dressed on more than one morning. This outfit demonstrates how to kill in the smart casual fashion department as a gentleman in his twenties.