Wellington City Council is planning a $50,000 prize pool for costumes at next year's IRB Rugby Sevens tournament.
Mayor Celia Wade Brown says the idea for a costume competition came from a meeting with Museum Hotel owner Chris Parkin.
Mr Parkin has pledged $5000 and will spearhead fundraising efforts.
Ms Wade-Brown says a costume competition will build even more interest in the event.
The Rugby Sevens tournament attracts about 35,000 fans each year. Wellington holds the rights to host it for another five years.