This casual pairing of a grey zip sweater and a white crew-neck t-shirt is a goofproof option when you need to look casually stylish but have no time. Feeling inventive? Shake things up by wearing dark brown suede derby shoes. When spring is in full effect, you'll love this outfit as your go-to for transeasonal weather. Wondering what clothing is appropriate as you get into your 30s? This outfit is the perfect answer.