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All answers having "Costume" as clue:

3 Character Answers:

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RIG



4 Character Answers:

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GARB

ROBE



5 Character Answers:

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DRESS

GETUP

GUISE

HABIT



6 Character Answers:

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ATTIRE

DOMINO

DRAMAS

OUTFIT

RIGOUT



8 Character Answers:

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ENSEMBLE

TOILETTE