Clothing (all fire-******ant):
-ballistic face mask
-ski mask (one big oval eye hole)
-type III kevlar body armor (vest, shin guards, knee pads, wrist guards, throat guard, etc.)
-BDUs
-combat boots
-fingerless gloves
-disposable surgical gloves
Weapons:
-brass knuckles
-two collapsible batons
-direct contact taser
-combat knife
-flashbangs
-smoke grenades
-.40 Glock 23 compact (primary sidearm)
-.40 Glock 27 subcompact (backup piece)
Accessories:
-plasticuffs
-digital camera
-disposable cell phone
-painkillers
-firstaid kit
-face paint
Training:
-first aid
-CPR
-Eskrima (batons, like Nightwing)
-Krav Maga
-Muay Thai
And a trenchcoat, one that I can take off and put on quickly, bought off the back of the dirtiest, smelliest hobo I can find, to wear over my "costume" when I'm not beating up criminals. No one pays much attention to homeless people. And the stink could work to my advantage. Could push around a shopping cart as part of the charade, and use it to store extra gear, like a police scanner.
Maybe a fedora too, attached to a big long thick dirty scraggly wig, to hide my face a when I don't have my mask on.
When choosing the guns I decided to go for something reliable and versatile, but smaller, lighter, and more concealable, so I chose a pair of Glocks over SIG-Sauers. The Glock 27 will accept magazines from the larger 23 model, so I can carry one set of mags despite using two different guns, an obvious tactical advantage.
Guns would be a last resort. That's why I'm not packing a shotgun, submachine gun, or assault rifle.