I'm 6ft 1in with my belly up. ordered 3xl (the largest size they have). Let's just say I was afraid the zipper might not hold. I would say it's two sizes smaller than the shirt and three times the pants.
Pros
Material: men's overalls with pockets made of 35% polyester and 65% cotton, lining: velvet; keep warm, comfortable, breathable and soft to wear.