Caledonian habit (4)

I believe the answer is:

kilt

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'caledonian habit' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

This is the entire clue.

Can you help me to learn more?

(Other definitions for kilt that I've seen before include "Checked menswear" , "Highland garment" , "Scotsman's attire" , "Highland skirt" , "Scottish costume" .)

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

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