Something fashionably labelled might have had this shape (8)

I believe the answer is:

heptagon

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'this shape' is the definition.
(heptagon is a kind of polygon)

I can't explain the rest of the clue.

(Other definitions for heptagon that I've seen before include "Seven-sided object" , "Seven-sided figure" , "A geometric figure with seven sides" , "Seven-sided shape" .)

I've seen this clue in The Times.

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