Apple-pie Order.
Prim and precise order.
The origin of this phrase is still doubtful. Some suggest cap-à-pie, like a knight in complete armour. Some tell us that apples made into a pie are quartered and methodically arranged when the cores have been taken out. Perhaps the suggestion made above of nap-pe-pli (French, nappes pliées, folded linen, neat as folded linen, Latin, plico, to fold) is nearer the mark.
