Woollen fabric requiring soft soap (7)

I believe the answer is:

flannel

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'woollen fabric' is the first definition.
'flannel' can be an answer for 'fabric' (flannel is a kind of fabric). I'm unsure of the 'woollen' bit.

'soft soap' is the second definition.
(I've seen this before)

'requiring' acts as a link.

Can you help me to learn more?

(Other definitions for flannel that I've seen before include "Woven woollen fabric or flattery" , "Bathroom item" , "Fabric; bland talk" , "Talk evasively; cloth" , "hedge" .)

I've seen this clue in The Telegraph.

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