Sort of a trench repair? If you cut a normal strap in the middle, make slits in the new ends to fit over the chin strap posts, remove the old chinstrap loops, turn the two parts around and connect the old ends with a hoop from your bread bag (or whatever), then this is what you get..
http://cgi.ebay.de/Pickelhaube-Infa...7QQihZ020QQcategoryZ34649QQrdZ1QQcmdZViewItem
http://cgi.ebay.de/Pickelhaube-Infa...7QQihZ020QQcategoryZ34649QQrdZ1QQcmdZViewItem
