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All answers having "Underwear" as clue:

4 Character Answers:

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LIME



5 Character Answers:

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LOOSE

PANTS



6 Character Answers:

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BRIEFS

SMALLS



7 Character Answers:

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DRAWERS

PANTIES

YFRONTS



8 Character Answers:

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KNICKERS

LINGERIE

SKIVVIES



11 Character Answers:

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BOXERSHORTS