The best replacement for belt loops is side tabs.

The best alternatives to belt loops are rated as following:
★★★★★  side tabs
★★  side adjusters

Your alternative for belt loops is not listed? Suggest!
Speaking about belt loops, one probably shouldn't forget about suspenders.

Other search terms related to belt loops and their ratings are:
★★★★★ suspenders
★ no belt
You have in mind a companion for belt loops and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of belt loops in all years. Click on graph for more.
belt loops
side tabs
side adjusters