Is Urban Outfitters breaking the law with their 'Navajo' panties and flask?

Urban Outfitters is no stranger to controversy -- the clothing retailer has come under fire for allegedly stealing designs, using "salacious" imagery, and promoting eating disorders. Now, the Navajo nation is demanding that Urban Outfitters cease to use the name "Navajo" on its products.

The Navajo Department of Justice sent Urban Outfitters CEO Glen Senk a cease and desist letter back in June, and now Sasha Houston Brown, a member of the Santee Sioux Nation, has written an open letter asking Urban Outfitters to re-evaluate what she considers to be "perverted cultural appropriation."

A quick search on the Urban Outfitters official website reveals that they have available Navajo socks, panties, a flask, jackets, dresses, bags, earrings, and more.

The flask has been deemed particularly insensitive given the long history of alcoholism within Navajo tribes, and the underwear "goes against the tribe's spiritual beliefs of modesty and avoidance of indecency," one Navajo designer tells Fox News.

In fact, it may also be illegal. "The Indian Arts and Crafts Act of 1990 (P.L. 101-644) is a truth-in-advertising law that prohibits misrepresentation in marketing of Indian arts and crafts products within the United States. It is illegal to offer or display for sale, or sell any art or craft product in a manner that falsely suggests it is Indian produced, an Indian product, or the product of a particular Indian or Indian Tribe or Indian arts and crafts organization, resident within the United States. If a business violates the Act, it can face civil penalties or can be prosecuted and fined up to $1,000,000."