The Per-Sec Signature Series holster removes excess material which allows the most options for placement on the belt without interferring with your ability to get into your pockets.
The build quality is excellent with no sharp edges and retention is very positive with a ‘click’ unlike I’ve felt/heard on any the other kydex holster I’ve owned. The same can be said about the Standard Mag Carrier. I have little concern about the pistol or mag falling out under aggressive movement and even with this retention, it still allows for a smooth draw.
Additionally, the belt loops are wide enought to fit snugly on the thick Ares Gear Ranger belt (as shown above) but still holds close to the body on a thinner belt like a Wilderness Original Instructor belt. The Signature series will not work with all belt attachement options but is still an excellent option for outside the waistband concealed carry.
See the complete line of Per-Sec Systems, LLC. holsters and mag pouches here.
High Speed Gear, Inc. (HSGI) 
This belt was put together with specifically with training in mind but is a very capable mostly universal system. I chose the HSGI Tacos because I own both AR and AK platform rifles which the tacos will accomodate. The pistol tacos will hold 1911 single stack mags to Glock 21 double stack mags as well as small-ish flashlights, multi-tools, etc. very securely.
The Bawidamann PUP system is a great design as it provides a wide and sturdy platform, keeping your pistol from flopping around. That combined with the HDPE stiffener sheet inserted in the padded battle belt to keep it rigid and the wet suit material lining the belt, you get very little movement and your kit is always in the same place. The PUP is also a great solution for mounting knives with kydex sheaths. check them out 
The Dark Angel Medical pouch is something I thought I’d try as it keeps all med-kit in the same place. It has a built in tourniquet pouch, meaning no rubber bands or loops to pull it through when you’re in desperate need.
BrutalRain 