Sons Of Anonymity Black Tee Shirt. This shirt has Sons Of Anonymity at the top with Hard Knocks Chapter on the back with a small skull & HKC on the front. This newly designed shirt is made of 100% pre-shrunk heavyweight cotton. This shirt comes in sizes; small, medium, large, extra large and double extra large. This company has been making shirts and other products for almost 25 years, their product line is awesome.