Marry a grey cardigan with a white print crew-neck t-shirt if you want to look casually cool without exerting much effort. Let your styling credentials truly shine by finishing off this outfit with black leather derby shoes. So if you're in search of an ensemble that's stylish but also feels entirely spring-friendly, this is it. You can take cues from combinations like this if you're approaching your late 20s and you want to take a more mature approach to your style.