Habit Tommy got into (5)

I believe the answer is:

khaki

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for khaki that I've seen before include "Military fabric" , "Dullish brown colour" , "Dust-coloured" , "Army dress material" , "Military clothes" .)

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

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