accessory (n.) Look up accessory at Dictionary.com
also accessary, early 15c. as a legal term in the criminal sense of "one aiding in a crime;" also "that which is subordinate to something else," from Late Latin accessorius, from accessor, agent noun from accedere "to approach" (see accede). Attested from 1896 as "woman's smaller articles of dress;" hence accessorize.
accessory (adj.) Look up accessory at Dictionary.com
1550s, "subordinate," from Late Latin accessorius, from accessor, agent noun from accedere "to approach" (see accede). Meaning "aiding in crime" is from c.1600.