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All answers having "Headdress" as clue:

3 Character Answers:

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FEZ



4 Character Answers:

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COIF

HOOD

TIAR

USED



5 Character Answers:

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MITER

MITRE

TIARA

TOPIC



6 Character Answers:

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BONNET

TURBAN



7 Character Answers:

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CORONET

TOPKNOT



8 Character Answers:

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FEATHERS