supporter - noun

a person who backs a politician or a team etc.

someone who supports or champions something

a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)

a support for the genitals worn by men engaging in strenuous exercise

supporter - thesaurus

admirer   assistant   booster   champion   friend   garter   help   helper   jock   jockstrap   patron   protagonist   sponsor   suspensor