After all, they wouldn’t offer any less protection than a bread-roll, discarded plastic soft-drink bottles, or even a cardboard carton. And no doubt that the 'spiritual' effect of Chassidish fur will also do them some good.
The chap sporting the concrete slab atop his skull probably has a better chance against flying rocks and shrapnel than his mate with his nut in the plastic waste-paper basket. Though appending it only with a scarf may be challenging.
So let's go for it, chaps...