Flip-flops are casual shoes, so it's best to keep it casual. However, there are definitely some stylish flip-flops on this list that wouldn't be out of place at a nicer event, especially in a beach town or somewhere where flip-flops are normal attire. Style your men's flip-flops with shorts and a t-shirt for full-on casual, or add a semi-casual collared shirt and some linen or other lightweight pants for a beachy, comfortable, but nicer look.