Get a gas mask or anything looks like a gas mask, make sure it conceals you then grab some gloves long rubber ones should do then some rain boots then grab some cans of soda and model to look like a grenade then use anything that’s cylindrical your torso size and make it to a large canister now for the shirt and pants find anything red (or blue) something that conceals your entire self

Here’s some links to some stuff

mask

gloves

boots

I hope this helps