A white crew-neck t-shirt and a black suit are absolute must-haves if you're putting together a classic and casual closet that matches up to the highest sartorial standards. To give your overall look a smarter spin, introduce derby shoes to this outfit. Rest assured, this combination will keep you snug as well as looking sharp in this in-between weather. So if you need outfit inspiration for dressing as you head into your 60s, this ensemble is a good example.