1, red bean tummy pants can be worn without underwear, but it is best to look at the specific tummy pants. You need to wear underwear if you don't open the gear, and you don't need to wear extra cloth in your crotch.

2, the correct way to wear belly pants is actually the same as the precautions for wearing stockings. Circle the waist of underwear into a circle, and then put the legs in; Pull up slowly and adjust the tightness of the front and rear sides; Pull the height of corset to the position of navel, and then adjust the tightness of waist; Swing your body back and forth and left and right to see if it is comfortable.