Anthony frowned. "Yes. Unfortunately, the club has a few members of the... unsavory variety. But they've taken every step to make it neutral ground. No magic is allowed to be used by any guests, no arguments are allowed, etc. Basically... it is meant to exist outside the realities of the world."
He smiled at her blush, and chuckled. "Yes, I'm afraid so. Muggle or Wizarding dress has to be formal. But let's face it... you look stunning in dress robes or anything."