Mary Bach ruined the light cotton fabric? (8)

I believe the answer is:

chambray

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

'the light cotton fabric?' is the definition.
'chambray' can be an answer for 'fabric?' (chambray is a kind of fabric). I am unsure of the 'the light cotton' bit.

'mary bach ruined' is the wordplay.
'ruined' indicates anagramming the letters.
'mary'+'bach'='marybach'
'marybach' with letters rearranged gives 'CHAMBRAY'.

Can you help me to learn more?

(Another definition for chambray that I've seen is " Mary Bach makes a lightweight woven fabric".)

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

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