Keeps you "clean"?

Paul

The idea is "most likely" to neutralize any chemical elements that would land on such a suit.

It's sounds like a poor man's method of making the old style of US military suits that we had to wear under our slicker suits along with the masks, gloves and boots.

Does anybody else here remember those old NBC suits?? I do, they had an oily feel to the fabric, were hot, and scratchy. It was like wearing some kind of oiled woolen clothing.

And don't forget the lead cup.

Perhaps the soap seals the fabric so the particals will not
get stuck in the weave ?

But the only way is Time, Distance and Shealding, and more mass is best.

Seals the fabric, and creates a soft surface for hot particulates to embed in?

I do not know wood it be more of a problem than having the hot dust get on the skin or inside the coveralls ?

I think the best way would be a cheep rain suit with gleoves and rubber boots and of course a gas mask and lots of duct tape. Or better still get the to a fallout shelter.