Hey Guys..
Longbow...
Yaa give that a try I think you'll like it...
You'll have to play with the length of the string in the back...
You want it fairly snug, but not that it's bothersome..
Put the knots on the inside of the grommets that way it will always stay the same.. The chin strap make just long enough to fit it over your chin..I've used it before in a bass boat doing 45-50 mph and it stays put...
If you want a nice little hat knife, get one of those Buck Hartsooks..Very light and handy to have...
In fact,, if you do decide to get one, I'll build you a custom sheath to put on your Tilley and send it to you.. Another Awesome little knife to use is a Simonich Bitterroot.. Would be Absolutely perfect for a hat knife. Can do one of those for ya too..

Just let me know if you want one and it's yours Brother..
Just gotta give me a couple weeks to get things straightened around with my dad..
LMK..
ttyle
Eric
O/ST