Oh, the plain white T-shirt. Everything about it seems so straightforward and ordinary. Just pop it over, and it plays a comfortable second fiddle to jeans, chinos, or in today’s world, a casual suit. If only it were that simple. Just as the menswear market has exploded over the past decade, so have the options for T-shirts. You no longer stop by the department or drug store for a three-pack, and then wear them both as undershirts and weekend casual garments.