Habit associated with crawling, maybe? (8)

I believe the answer is:

swimsuit

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'habit' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for swimsuit that I've seen before include "Bathing-costume" , "female garment" , "Beach costume" , "Bathing attire" , "Outfit for a dip" .)

I've seen this clue in The Times.

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