I’d pick a black lightweight wool gabardine that can be worn year-round, doesn’t wrinkle easily and wears well. A universally flattering and classic style is a one-button fitted blazer that reaches just below your hips with straight-legged flat front pants. The right fit will make any suit look like a million bucks. Make sure the sleeves reach to the base of your thumb and that the fabric is not pulling between your shoulders. The torso should be gently fitted, not boxy. A versatile and basic wardrobe staple, a black pantsuit is worth the investment. Buy the best one you can afford. Quality tips I look for: flat seams, especially around the shoulders; a lining that’s not puckering or stretching; cloth not foam shoulder pads; and properly placed buttons and buttonholes.