Alot depends on who you are training with and the level of class and instruction.
Running mags out of your pockets is a dumb idea, for the classes I’ve attended. you will only slow everyone down, including yourself, thus reducing the amount of learning going on.
I understand the whole, train as you fight thing, but do that at home, on your time.
The instructor has a minimal amount of time to put out as much info as possible to a wide array of ability types. Stopping to pick up mags that have fallen from your pockets, or rounds that have become dislodged due to pocket carry, no place to put partially spent mags, etc etc all slow stuff down.
Pat Rogers has written multiple times on what to bring to class, check here, Lightfighter, 10-8 and his web sight. What does the instructor of your class recommend? and Why?
What are you running for carry gear for your pistol now?
I would run my standard carry gear, for the shortgun.
For the longgun,
There are a number of basic chestrigs, from Eagle, Blackhawk, Spectre, SKD, ATS, etc. etc. They are inexpensive, hold 3-4 rifle mags and maybe 2 pistol/light mags. Add a basic roll up dump pouch and your set. For the amount of monay you will spend on teh class, in tuition, ammo, etc. another 150 bucks for a basic rig is money well spent.
You will also have it available for future classes, or the various red dawn, zombie, end of the world scenarios, that you may find yourself in.
Seriously, I’ve taken alot of classes, and I would not attend with mags stuck in my pocket. You don’t need a full on heavy vest, but you need something.
Check out,
Eagle chest pouch .223, about 75 bucks
ATS low profile chest rig, about 100 bucks, and it has two GP pouchs on either side, which can be used to carry water, lube, etc to the line, and the other as an improvised dump pouch.
Having a basic set up like that, will allow you to concentrate on the class, and not be constantly fooling with less then optimal gear setups.
Bob