In a well-rounded fashion diet, T-shirts are a lot like protein: You need them to grow big and stylish. Outfits looking wimpy? Add the best heavyweight T-shirts to the mix and watch ‘em pop. While standard T-shirts are like an everyday salad bowl—healthy, reliable, occasionally depressing on their own—heavyweight tees are more like a prime cut of ribeye—hefty, indulgent, a complete meal with or without the sides.
But heavyweight T-shirts aren’t simply heavier for the sake of it. That…

