Last evening after I posted, I decided to dig out an old Ace Bandage from a few years back when I broke my ankle. I found it, got some velcro from my sewing basket and made my own "homemade chinstrap" for the first time. Turns out I had the best leak line ever: actually straight !!
(I always use chinstraps in addition to my taping with 2 horizontal strips of J&J Waterproof Tape (MUCH easier on the face than the M&M Cloth Surgical Tape that I recently ordered . . . ouch, never again!)
My homemade chinstrap:
* Used 2-inch Ace Bandage (the kind that comes with the metal closure, which were NOT used).
* I made a DOUBLE thickness of Bandage and held it taut from my chin to the top of my head until it was the tightness I wanted. Then I put a pin in it to show me where to sew. I sewed ACROSS the elastic a couple times on the machine to make it secure and permanent.
* Used DOUBLE SIDED velcro (rough on one side; felt-like on the other) - Wrapped it around the Bandage on one side (so the velcro would stick to itself), then took it around the back of my head and fastened the other side around the Bandage on that side. Note: the soft side is on the "outside" so it will not catch on bedding or "tights ties"; the slightly rough side is against the hair and does not catch on it if you have the right velcro (not the "fish hook" type). Note: I did this while on my head to get it to fit properly. Then I carefully removed it from my head, and "reinforce-sewed" the velcro where it wraps around the elastic (just a reinforced line - the width of the Bandage - zig-zagged a couple times on the machine).
I've actually made a pretty nifty chinstrap . . . it's in one piece and ready to go anytime. Holds my chin very securely and is comfortable to wear. The velcro band around the back of the head seems to make it the most secure chinstrap I've had (no slipping). I put it on after I tape, and before I put on my mask. Looks like I have no need of trying to find another chinstrap to buy!
PS - Guess someone could try the Ace Bandages that are from a different material that is "self sticking", and wrap that around the chin to top of head once or twice. (It doesn't "look" as soft a Bandage, it's a large weave; don't know how comfortable it would be on the face). Is that what you use, Dreamstalker??
Does it stay securely on without a strap going around the back of the head?