In the context of porn video tags, "leather" refers to scenes involving BDSM (Bondage, Domination, Sadomasochism) where one or more participants wear leather clothing or accessories. Leather is often associated with a sense of power and control in these scenarios. This can include items such as leather gloves, whips, collars, cuffs, harnesses, or full-body outfits like chaps or skirts. The presence of leather in a scene usually signifies a more dominant or controlling role for the individual wearing it. It is a common fetish element among BDSM enthusiasts and can be an important aspect of their sexual expression.