I shoot my EDC CM9 in BUG/MM,I use one of my EDC holsters, IWB hybred, made by a fellow shooter, on a 5:11 1.5 dress belt for matches although I also use a Rosen OWB pancake, and a 5:11 fuzzy holster for pocket carry (it sticks to velcro when in the car) stays upright as some of my pants pockets are snug; my carry mag holder is a Leatherman pouch carried horizontally on the belt @9:00 flap to rear, bullets down.
for matches, I use 4 7rd.(6rd.loaded) extnd. mags, (easier to grab) bullets front, in vertical nylon knife pouches w/cut off'd flaps, the most forward is 9:00, the rearmost is the load & make ready mag; my IWB/OWB are worn @ 4:00 always.
my IWB is a faster draw then the Rosen which is still pretty stiff yet(former USPSA gamer) I should start using it more to break it in, and pocket holsters are unacceptable for safety reasons in IDPA. hope this will give you some ideas to start from.
NRA LIFER
IDPA BELEIVER