Nuclear fallout protective suit is just some pieces of clothing so that you don't get contamination on your skin. Tyvek coveralls, rubber boots, rubber gloves, hood, mask and respirator with all edges sealed with duct tape would make a fair approximation of what's needed.

Then you need a decontamination shower to rinse off with if you go anywhere the suit is needed OR you carefully remove and dispose of it w/o getting any on you. (a LOT harder than rinsing)

You'll also need some dosimetry to know whether you don't need the suit, whether you'll need to minimize time you are out using it, or whether you'd be risking your life going outside suit or not.

Let's hope none of us needs to use this info.