Costume (6)
(Other definitions for attire that I've seen before include "Wear" , "12" , "Formal dress or costume" , "I treat badly the dress." , "Clothing, apparel" .)
'costume' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for outfit that I've seen before include "Set of clothes or equipment" , "Team" , "Organistion or set of clothing" , "Cohesive unit, eg a military company" , "what to wear?" .)
'costume' is the definition.
(I know that rigout is a type of costume)
This is all the clue.