Hi afcai,
The maternity belt is not suppose to tighten the tummy. It come with different sizes.
Hi sung,
Belt type can be found in most maternity shops. You can ask the SA for trying. I usually wear pants and I felt belt type is bulky to wear. Cotton type can wash. If bottoms come with support band, then no need to wear support belt. So far, I only wore twice when going shopping during weekends.