Good morning, I am trying to find out if there was a regulation about the leather things in the cockpits (like seat pads, control column seals, bags and pockets...). I've seen some brown and black seats and column covers, pockets are mostly brown. Was it just luck which colour they were, or was any kind of rules to sort out which colour had to be used?   (it's about the cockpit of the Mosquito B.IV, but a general rule would help for other projects as well...)   Alex