When I was in the mob and flying;
Left lower leg; Chip hat and pilot's handbook
Right lower leg; Stuff I really should know but can never remember, also quiz book for Atlantic transits and EO trips.
Thigh pockets; old maps and fluff
Knee boards; QFE, weather and piloty stuff
Underneath knee board pockets; sick bag, essential for the odd foray down the back in the kipper fleet.
Hip pockets; gloves
Chest pockets; wallet, keys, change, passport etc etc, blah....
Knife pocket; erm knife when we were given one, other than that a cardboard box opening device/dingy thing.
Basically whatever you feel comfortable with in whatever combination, although old maps and fluff are a given.