Again it depends on the fashion of the local EMTs but here's how we do it in NYC.

You EMT pants are held up by regular leather 1.5 inch belt. You can also instead of leather use Last Resort Belt .

Duty belt is what Army had as a pistol belt. Here you can see example. We wear duty belt on top of our regular belt. Just like you would wear LCE in the Army (minus suspenders). Duty belt is not getting fit thru the belt loops on your pants. It is stand alone part of your uniform than can be ditched if you snag on something.

This is radio/shears/misc items holster I use: Conterra Trauma Pro EMS/Radio Holster ( link ). It can be fitted for most of the radios out there. It has two side pockets: one that would fit ARC AA and second will fit wrench/key to open oxygen tanks. It also has a small pocket for about 6 pairs of gloves. This seems to be very popular item out here.

Besides that I have a flashlight case, multitool and extra pouch for rubber gloves.

Let me know if I can help you any further.

Matt