Random Magic Armor (any level)
(Self-revealing) valued at 3,650 gp.
A suit of armor with this capability appears normal. Upon command, the armor changes shape and form to assume the appearance of a normal set of clothing. The armor retains all its properties (including weight) when glamered. Only a true seeing spell or similar magic reveals the true nature of the armor when disguised.
Aura: Moderate illusion
Caster Level: 10th
Requirements: Craft Magic Arms and Armor, Alter Self
Price: +1 bonus
Source: Dungeon Master's Guide v.3.5