as in, you want the entire costume to be a possible random selection?
you could dump all of the costume pieces on a single menu for it to be selected at random, but you would still get all the other menus to be also randomly chosen so it wold look bad.
if you just want all of the pieces to be possible to be selected, using the simple settings register method of not specifying modtypes should work:
my_mod_file.swf=name_i_want_here
anyway, the shuffle is meant to shuffle all of the clothing menus, not to shuffle between characters. (not sure if there is something that does that, anyone know?)