We kinda had something like that with plate armor. A lot of the techniques for making really advanced plate armor were lost by the 20th century, and the in latter half of the 20th a bunch of larpers and medieval nerds started reverse-engineering existing suits, consulting what manuals survived, digging through museums, and now we're back at a point where there are a couple of shops in the world that can make the rally good stuff if you can put down, ikd, it's probably 15k these days.