What IS a "Rob Roy" Sporran?

Why are simple leather pouch sporrans called Rob Roy sporrans when evidence suggests he used a brass cantle sporran which was becoming "popular fashion" during the early 18th century? Is this just a renaissance fair fashion thing? Are Rob Roy sporrans historical? -------------------------------------------------- Started in 2003, USA Kilts is a team of kilt makers and artisans located in Spring City PA. In 2017, we made it our mission to build community and bring kilts and Celtic culture to the forefront with our YT show: Kilts & Culture. http://www.USAKilts.com Find Your Tartan!: https://www.usakilts.com/galleries Youtube:    / usakiltsofficial   Facebook:   / usakilts   Instagram:   / usakilts   E-mail: sales@usakilts.com