Twister The Belt Alternative Good for kids too.

thingiverse

I frequently wear shorts outside of work, but I often find myself not wanting to wear a belt. So, I created this solution a long time ago, and I've been using it ever since. My kids have also learned how to use it, and they're familiar with the design. If we lose one, no big deal - we can simply print another batch. The pictures show the steps clearly: just insert the clip onto your pants or shorts and twist it into place. It stays secure that way. To get a tighter fit, you'll need to twist it again.