Dress without thinking? (5)

I believe the answer is:

habit

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'dress' is the definition.
(habit is a kind of dress)

I can't explain the remainder of the clue.

(Other definitions for habit that I've seen before include "Propensity" , "Monk's robe or repetitive action" , "can cause addiction" , "It's worn in order" , "Riding garment" .)

I've seen this clue in The Globe and Mail.

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