I noticed this thread for Boba, and have yet to respond. My personal observation while wearing Mandalorian armor is to just take slow deliberate steps, head slightly tilted forward.
When turning to look at someone, do it slowly. It will convey an aura of menace without even trying!

Standing at rest w/ hands on blaster, or in the case of Jango, both hands crossed, or rather arms folded works well.
If you just turn your head, as if scanning the room, while not moving your body, it creates a nice effect too.
Your body language needs to suggest that the armor you're wearing feels like you live in it...
You'll also need to fasten two straws together, w/ one being a bendy straw, to drink out of anything...

It's a helluva way to drink a beer, but it's the Mandalorian way!!
