In reply to TobyA:
That sounds about the right vintage! They're hand me downs from either my dad or granddad, not sure.
Yeah the PTFE lining has had it a bit, but the fabric seems pretty robust so they've got some usefulness in them yet I'd think.
I think I'll get hold of some seamgrip, see if that holds it and if not, get the sewing kit out. I hadn't hear of seamgrip before. so thank you for the suggestion to those who made it!