I started training for IPSC matches. I had an instructor go over some of the basics I would need for my first match. He is a fanatic and has all the expensive paraphernalia necessary for open competition. I don't want to go there yet, but what I discovered is that the gear I have for defensive handgun classes will not work well for IPSC matches.
What I used was a Sidearmor holster Sidearmor: Kydex® Holsters, Shotgun Equipment, Rifle Equipment and firearms accessories similar to this one but without the cutout and some Blackhawk mag carriers. I don't need to get as fanatically with it as my instructor does as I am in this more for the fun and practice than winning any competitions.
What would by your recommendations for a good holster and mag carriers for IPSC? I would be in a production gun category shooting my Glock 23 (for now).