Chin strap

[Ioannes]

Salvete, Romani! My Roman helmet (Italic, I think, not sure which letter designation) didn't come with a chin strap, and I kinda want one. There aren't any holes to add a legitimate strap, so for a cheap DIY temporary one I just got some leather string and gorilla taped it to the inside of the cheek plates (which is actually pretty good, believe it or not), but I'm wondering if there's a better way to add a chin-strap short of buying a new helmet. Any advice helps. Gratias!