Question

what does accessory mean here?
\the right accessory can make or break your outfit,\ the saleswoman at the boutique told maria.
accessory noun an item used to enhance beauty or usefulness
accessory noun a person who helps another person commit a crime

Explanation:

In the context of "The right accessory can make or break your outfit", it is related to fashion (outfit). The second meaning (a person who helps another commit a crime) is not relevant here. The first meaning "an item used to enhance beauty or usefulness" fits as it pertains to fashion items that enhance an outfit.

Answer:

An item used to enhance beauty or usefulness.