Why is so hard to get fit properly if you're a big or tall man? You may be a big size, but not a tall size, and visa versa. In other words, just because you need a tall size doesn't mean you need a big size. And to make matters even more confusing, most men's stores don't even know the difference. That's why most big and tall men continue to experience frustration in trying to find clothing that fits properly and comfortably.