I was searching the internet this morning for photos of the olive drab helmet cover in use during the Korean War, and I came across this site:
Korean War Photo Page
There are plenty of photos of covers, but they are burlap/hessian. I've never associated this kind of cover with the Korean conflict, or seen any before, so I thought I'd post the link. Some look neat and tidy, and some are er, not so. :-) Another idea for a display perhaps? Anyway, loads more photos at the site.