For an outfit that's smart and Kingsman-worthy, go for a grey plaid blazer and navy dress pants. We love how this whole look comes together thanks to dark brown leather derby shoes. And if you're scouting for a cool getup that transitions easily into spring, this one fits the bill. As you're transitioning from your 20s to your 30s, you probably want to start dressing maturely. If that's the case, ensembles like this are a goofproof option.