For a casually cool outfit, reach for an overcoat and black jeans — these two pieces play really cool together. A trendy pair of burgundy leather derby shoes is the simplest way to give an extra touch of style to this outfit. If you're looking for a kick-ass winter-to-spring outfit, this one is great. So if you need outfit inspiration for dressing as you step into your 30s, this outfit is definitely worth saving for later.