Wear a blue double breasted blazer with grey dress pants for a neat polished ensemble. Dark brown leather loafers are a guaranteed way to bring a sense of stylish casualness to this look. This ensemble isn't a hard one to put together and it's summer-appropriate, which is most important when it's super hot outside. As you're maturing from your 20s to your 30s, you probably want to start dressing in a sleeker manner. That's when combos like this are a tested option.