So...I extended the 'bib' on the hyena mask so it goes down past nipple length in the front, and almost that far in the back. Sadly it still pulls out from under my shirt when I move my head around a lot. :/
Here are me ideas for dealing with this:
* Add extra slack on the neck, a bit of double chin. That'd give the slack needed for craning the head up (which I frankly have to do to see faces, it's a hunched head position--totally appropriate for a hyena, but occasionally one needs to see)
Downside: This won't help with turning or with the back, where I've added some padding to give a bit of that horselike hyena neck.
* Suspenders worn inside the shirt, elastic straps to pull it back down when it gets yanked up.
Downside: ...connected to what? Since this has to be under the shirt, the'd have to clip to my underwear...wedgie city?
* Wear a form-fitting T-shirt under it, and use velcro or something to attach the edges to the shirt.
Downside: More layers make sweaty big guys like me sad. :/ And maybe it'd just result in the shirt being pulled up over time.
* Extend the 'bib' to go under my arms so they can hold it down. Perhaps have an elastic band running around my chest to hold the middle of the front down.
Upside: Under my clothes, I get to dress like Leeloo from Fifth Element.
Downside: ...more stuff jammed in my pits? Actually this seems pretty practical.
Any of y'all have experience with this? I assume I'm not the first person to have this problem!