Originally Posted by
Shantzu
Have an additional tab in the character menu. That tab has its own additional tabs for multiple costume sets. Use a radio button to select which set you'd like to have on. Each piece of armor in the selected costume set can be turned on or off and the effect of that piece will override your current armor set (I.E. if you pick costume set A to wear, and select to show the piece you've put in chest slot (Herklaedi), it will cover the appropriate pieces in your current armor set). Allow the items placed within the costume slots to be removed from your inventory and saved in these slots so they don't remain in your inventory, taking up space.
PLEASE take this as an opportunity to greatly improve the functionality of glamour for your user base. Having the ability to use multiple sets is very fun for the players and I think you will find a positive reaction from the community if you move it to this kind of system. If you need an example to go by, check out RIFT's.