There are a couple of screen captures that show a wire/cable running from Boba's left breast plate and connecting to a 90 degree XLR plug on his jetpack.
BooBoo Fett has modded his costume accordingly. See this thread (post #44 for details):
I love the idea, and I bought all the stuff with which to do it. However, I don't see the cable and plug in enough shots to determine whether it was only included on the stunt costume or if it's the hero costume.
Can any experts chime in with their analysis? It'd be greatly appreciated.