A black and white short sleeve shirt and jeans are a modern casual combination that every modern guy should have in his casual styling collection. If you want to effortlessly up your look with one single item, complement this ensemble with a pair of black suede chelsea boots. You might be thinking that just because it is snowing outside you have to sacrifice smart style, but that's just not true, and this ensemble is a shining example. This pairing proves that as a 30-something gentleman, you have a wide range of dressing options.