The material below is Open Game Content from a 3PP Source
Cloak of Etherealness
Aura strong transmutation; CL 15th
Slot shoulders; Price 55,000 gp; Weight 1 lb.
This silvery gray cloak seems to absorb light rather than be illuminated by it. On command, the cloak makes its wearer ethereal (as the ethereal jaunt spell). The effect is dismissible. The cloak works for a total of up to 10 minutes per day. This duration need not be continuous, but it must be used in 1 minute increments.
Requirements Craft Wondrous Item, ethereal jaunt; Cost 27,500 gp