Filed from 3 published puzzles

COSTUME

Set to 3 different clues across 3 published puzzles, most often “Halloween purchase” — The New York Times, Sunday, 23 May 2010.

7 letters

Every clue on record, most used first

Halloween purchaseonce
The New York Times — Sunday, 23 May 2010
Something you might go to a party inonce
The New York Times — Thursday, 13 November 2008
Get-uponce
The New York Times — Sunday, 2 March 2003

Other answers to these clues

ALEG4 letters
ARISE5 letters
ATTIRE6 letters
EGGS4 letters
ELATE5 letters
MASK4 letters
RIG3 letters
RISE4 letters
ROUSE5 letters
ROUST5 letters
TOGS4 letters