For a casually sleek ensemble, team a black sweater vest with a blue denim shirt — these two pieces fit really well together. Rounding off with a pair of dark brown suede desert boots is the most effective way to infuse a dash of stylish casualness into this getup. Clearly, an outfit like this will keep you warm and stylish all season long. Wondering what you should wear as you pass the big three-oh? This ensemble is the perfect answer.