When the dress code calls for an effortlessly stylish look, go for a charcoal cotton blazer and black jeans. If you wish to effortlessly rev up your outfit with one single item, why not introduce a pair of black leather derby shoes to this ensemble? This look is also great if you're on the lookout for hot weather wear to make a slow day more bearable. Wondering what you should wear in your 20s? This combination is a perfect example.