A bondage hood also called a gimp mask or bondage mask is a fetishistic hood. The use of bondage hoods can be hazardous if breathing is impeded.
Sexual fetishism - Wikipedia
However, International Fetish Day has taken over from it. On National Fetish Day, one of the main aspects is that members of the community wear an item of purple clothing as a sign that they are a member, in an event known as Perverts Wear Purple.
Bondage (BDSM) - Wikipedia
International Fetish Day - Wikipedia
Clothing fetishism or garment fetishism is a sexual fetish that revolves around a fixation upon a particular article or type of clothing , a collection of garments that appear as part of a fashion or uniform, or a person dressed in such a garment. The clinical definition of a sexual fetish would require that a person be fixated on a specific garment to the extent that it exists as a recurrent or exclusive stimulus for sexual gratification.