[widey] Personal preference depending on where you went into knid. You don't have to wear anything but it might hinder an escaping move through Westminster or Embankment if you don't.
I shall saunter along to Camden Town, adjourning to the World's End.
[widey] the only rule re-footware is that it must cover the whole foot... which leaves me with a move to St James' Park nipping to the Buckingham Arms for a dose of Waggle Dance.