Hill’s coat probably is woven material (9)

I believe the answer is:

sailcloth

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'material' is the definition.
(sailcloth is a kind of material)

'hill's coat probably is woven' is the wordplay.
'hill's coat' anagrams to 'SAILCLOTH'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for sailcloth that I've seen before include "fabric" , "I call host (anag) - canvas" .)

I've seen this clue in the Sydney Morning Herald.

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