My girlfriend is a brides maid for her best friends wedding. She had to get measured for the dress. She's a big, big, fat lass and it took the guy in the shop about an hour and three tape measures to do it. Finally he says 'ok its all sorted, I've got your size, you're a mark F.' 'I've heard of dress sizes, 10, 12, 18, 20 etcetra' said my missus 'but what is a mark F?' The guy replies 'A size up from a marquee.'