eBay

Brand new with tags, officially licensed product from Disney:

Limited edition item
Detachable 50 inch Cape

Size Chart

one side lying flat (1 inch = 2.54cm)

Size	M	L	XL	2XL
Armpit to Armpit	20 in	22 in	25 in	26 in
Shoulder to Hem (front)	28 in	27 in	29 in	29.5 in