The combo of a grey double breasted blazer and a tank makes this a cool casual menswear style. Rounding off with a pair of black leather chelsea boots is a simple way to bring a bit of zing to your getup. As you can see, this combo is a really great option, especially for weird transition weather, when the mercury is getting lower. As you step into your 30s, you want to start dressing more like a mature gentleman. In this case, combos like this are ideal as inspiration.