We have 25 Key Item slots. Even if you ignore the fact that these Key Item slots are used for things like quest items and maps, 25 is WAY too small a number for a lot of glamour enthusiasts.

A ticketing system to hold full sets of armor isn't a terrible idea (they DO condense five items into one - six, if you include belt or weapon, and seven if you include both), but these tickets should stay out of the Key Item inventory.