I remember the tango men.
Then there's been the Elvis's, and one time some of them turned up in Emu costumes and invaded the pitch at half-time.
I remember one of the Emu's pecking Chris Warren and him getting all flustered and calling for security.
Last time they dressed up (I think), was at Brentford when they dressed in a Dad's Army theme (think there was a Hitler among them).
As for dressing as your mum, I've already turned into mine.