For an ensemble that's super simple but can be flaunted in many different ways, opt for a multi colored horizontal striped crew-neck t-shirt and navy jeans. For a modern on and off-duty mix, complement this outfit with aquamarine athletic shoes. Naturally, you're looking at a savvy idea for a blazing hot afternoon. Wondering how to perfect casual dressing as you head into your 30s? This pairing is the perfect answer.