I also have an ESB Vader costume and bound the bells to the shoulder armor via elastic straps and snaps. Very easy. Just purchased all the supplies at walmart, black 1" elastic roll, e600 glue and a packet of heavy duty snaps. Just glue the male end of the snaps to the underside of the shoulder armor and the bells. Measure out the required amount of elastic tape, punch a hole thru it with a knife and fasten the female snaps to it. Presto, very easy and quick. Works great.