When comfort is a must, this pairing of a light blue blazer and navy jeans is a winner. Add a pair of tan leather brogues to the mix for a masculine aesthetic. Clearly, it's easier to work through a boiling hot warm weather day in a easy and breezy ensemble like this one. As you're transitioning from your 20s to your 30s, you want to start dressing more professionally. In this case, combinations like this are a goofproof option.