Sheer material Princess Diana caused a stir in at a 1981 Victor and Albert Museum event (7)

I believe the answer is:

chiffon

(Other definitions for chiffon that I've seen before include "Fine (semi)transparent fabric" , "Sheer silk or rayon fabric" , "Thin light fabric" , "Fine material" , "Fine, near-transparent fabric" .)

I've seen this clue in The Times.

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