Best T-shirt/No backpack Gopro style camera attachment to shirt?

[mrdeadheadr]

Want to start filming hunts.. But I have an axis deer Maui hunt coming up in the spring, where I wont have my backpack on me while crawling/stalking..

Just not sure of any good ideas how to attach an action 5 camera (gopro style) to my sythentic hooded shirt... any ideas?

Maybe a hat attachment.. not sure if there's a good one if anyone knows of possibly

Thanks!!