He started off designing costumes for his high school plays, but actually studied mechanical engineering at the University of Florida.
He later went to Hollywood to attend art school, eventually signing a contract with Warner Bros.
(both 1954), The Manchurian Candidate and Mutiny on the Bounty (both 1962), The Silencers, Murderers' Row (both 1966), The Detective (1968), Bob & Carol & Ted & Alice (1969), The Shootist and King Kong (both 1976).
One of his most iconic designs was the red jacket sported by James Dean in Rebel Without a Cause (1955).
Mabry declared that his most difficult filmic assignment was the multiple costume changes required for Elizabeth Taylor in "Giant" (1956), which called for 42 changes of clothing.