This laid-back pairing of a beige turtleneck and black jeans is extremely easy to pull together in no time flat, helping you look dapper and ready for anything without spending a ton of time searching through your wardrobe. And if you need to immediately ramp up your ensemble with one item, introduce a pair of tan suede chelsea boots to the mix. If you're wondering what you should wear as a 30-something man, this combo gives a fair idea.