Make lower star versions of your armour go to your costume tray.
Persay you have a 5* armour, you like the stats on it, but prefer the look of the 3* armour version. Have it so that it can be worn as a costume in the costume menu. It saves you having to re-craft it twice, yano?
o.O
you can wear any armor in your arsenal as a costume... click the piece you like and "equip as costume"