I've purchased neattucks, which has an ad in Referee magazine. I ordered 2 pairs and like them much better than the foot stirrups or the the belt.
Neat Tucks - The Best Way To Keep Your Shirt Tucked In - Best way to keep shirts and uniforms tucked in
I saw a couple of my fellow officials with them and they make you look professional with the shirt being flat and tucked in (no blousing).
Kevin