Try this belt. It attaches to the belt loops, and works great to hold up pants without putting pressure between those attachments. I would wear it sideways after my spine surgery so it didn't press on the incision, which is on my side.

https://www.amazon.com/gp/aw/d/B01MRMDLED?psc=1&ref=ppx_pop_mob_b_asin_title

After my spine surgery, I couldn't bear any pressure against the scar for months. It is on my right side (XLIF surgery). So I got this belt

https://www.amazon.com/gp/aw/d/B01MRMDLED?psc=1&ref=ppx_pop_mob_b_asin_title

And attached it to the right. Held my pants up without putting pressure on that area. I would have to unsnap one side, but it was better than any other option!