I never go alone, we always bring:
Illumination: Multiple chem-lights (glow sticks) for room marking or danger marking, two TL-122-D Military Flashlights, Maglite Mini-Mag, Headlamp and Explorer Pro NOCX5 Night Vision Monocular.
Footwear: Type-II Military Issued Combat Boots, Type-I Military Issue Jungle Boots, Wolverine Worksite Steel Toe Boots, 100% Cotton or Wool Socks.
Safety Items: CVC and PASGT-V Body Armor. Works amazingly well against falls onto shape objects or possible stabbing or shooting threats. Got ours from family and trading, can pick it up online for cheap, heave leather work gloves with plastic liner to prevent contact with liquids or powders.
Clothing: BDU/ACU or similar clothing. Designed for sustained wear in rough environment, reinforced knee and elbows, double stitched through-out, camouflage properties, multiple pockets, ect....
Tools: Crowbar, wire cutters, bolt cutters, Phillips and flat head screw drivers, lighter, road flare, small survival kit, radios or phones, respirators, knives, maps and schematics of the area (if available), multi-tools, ect...
We also all wear LBE or LBV (military web gear), has tons of pouches and pockets, carry small ALICE packs for gear, canteens and camelbaks for water, energy bars and MRE's.
Carry a change of normal clothing as well
You mention right here using "CVC body armor"
Edited:
And yes, i know BDU andACU are cuts, thats why i mentioned BDU in m81 and DCU or with ACU using UCP pattern.
Edited:
And because the thread is called what should you take when you go urbexing, and you posted what you take, I thought you were giving your advice.