There is now evidence that bras and other items were set afire, if briefly, at the 1968 Miss America protest in Atlantic City.
The year women refused to stay silent, tossed their bras and redefined politics - The Washington Post
Tiffany Tiffany Patterson
100 Women: The truth behind the 'bra-burning' feminists - BBC News
Case of the Week - Gorgas Course
March, 2012
Women Protested Miss America's Sexist Standards 50 Years Ago
Did “bra burning” ever really happen!?
Gallery: Winning decorated bras in the BRAvo competition
The Myth of the Bra Burning Feminists of the Sixties