A bandanna or bandana (from the Hindi: बन्धन bandhana, "to tie") is a type of large, usually colorful, kerchief, usually worn on the head. Bandannas are frequently printed in a paisley pattern.
Bandanas are also traditionally used as handkerchiefs by manual laborers and outdoorsmen, since they more practically hide stains than a white handkerchief. Thus they come to symbolize social revolutions. Anarchists participating in a black bloc, as well as other protestors, may wear a bandana over their face to conceal their identity and provide some protection against tear gas and pepper spray.
Here is a fun Mister Freedom bandana by JCrew