what about that bias factor (or what ever its called) they have to use to stop them from devouring stuff and getting really hungry... maybe it alows them to take it off for a few mins to change clothing and have a wash/shower.
or maybe it can be taken off freely just not when they hold onto the god arc?
looking at what my avatar wears and im going to go with what craz said and go with zip on stuff... i noticed there was a gap between the glove and the sleeve for the armlet. and goldish lines that could be zips...
my other therio could be that it works abit like Iron Man device that talkes his armor on and off (or something more cool like in Tron2). that would explain the square pad on the terminals that they stand on in their rooms.
as for the armlet... the case with the crossive hannibl comferims it cannot be taken off.