Mistress is the term used broadly to describe a female Dominant in a Kink, Fetish, or BDSM relationship or play session. A Mistress can own, control, or can be in a relationship with a sub or slave of any gender or sexuality. A Mistress is served by those she deems worthy of her attention.
A true Mistress is NOT a 'Lady Bizarre', which means she does not have sex with her clients. A Mistress with a 24/7 slave may, however, use that slave for sexual gratification as that person has willingly become her property.
The stereotypical look portrayed in the media is that of a woman dressed in leather, and latex. PVC or gothic clothes. A Mistress can, however, be of any body shape, weight, height, and dress as she wishes or in what makes her comfortable.