I'm running a Glock 19 Gen 4 in a Bravo Concealment RTT (Kydex) holster and I've been really disappointed with what I've tried out so far.
First, I started with a KT-Mech Gun Belt with the plastic buckle and running 1.5" belt loops on my holster. The belt was far below my expectations and I sent it back for a refund. At that point, I decided 1.75" belt width was probably going to help in terms of rigidity, but I needed to look for stronger webbing and nylon reinforcement.
On the rack at my local Sportsman's Warehouse, the 5.11 Instructor Belt feels pretty rigid, but it's made in China and about this time I decided that I'd like to go with a Cobra buckle. So I did a lot of research, read lots of reviews, determined which companies didn't have a 2-3 month backorder and then made my decision from there. I then ordered the Cobra Riggers belt from Elite Survival Systems (approx $80 shipped, Amazon). But just as I feared, that giant ass D-Ring was a bit too much. So I started looking for something equivalent without the D-Ring. I landed on the First Spear Assaulter's Gun Belt (approx $75 shipped, SKD Tac). Today I received it and although it was only about $5 less in cost, it feels like it's about $25 less in terms of quality and rigidity. I have to ask myself "do these belt manufacturers even test their gear with an actual holstered, fully-loaded handgun?" It still feels floppy and limp to me (the belt, I wasn't referring to anything else...). So now I'm out $20+ just in shipping costs (including return shipping) and wondering if I should send the First Spear belt back and try a fourth time.
Any advice or input is greatly appreciated. This trial and error process is getting really old. When I unholster my weapon, the belt seems to give too much and the holster wants to move upwards. Side to side, and front to back movement also feels like it's too generous.