I'm plus-size men and I asked at My-Steel, if an chastity belt may be suitable and I am afraid that I will get the KG over my hips even when closed. I got the following answer:
"Your fear is not entirely unjustified. A hip model would be ideal. Here's what you do:
Take a leather belt and put it on very tightly below your belly. Then try to slip the leather belt over the buttocks. If this goes very easily and the belt is tight, you should refrain from this investment. The problem, if you look from behind, back, loin, pelvis and butt area are on the same level, then stripping is very easy."