I didn't see this myself, but was told, back in the 70s, that a team whose name I can't recall (or it may have been an anonymous scratch team - I think they were masked) did a 'Flashers Morris', complete with dirty macs, at either Sidmouth or Whitby. There was a figure in which they all turned outwards to face the audience and opened the macs in time-honoured 'flasher' style. They were, of course, discreetly covered....except one.
I wasn't there - I only heard.
JK