What would an early RAF WW11 Pilot wear when flying

I am considering having a dummy full size pilot in my replica cockpit but I really don’t have much of a clue about what would be authentic pilot wear around 1939-1940. I don’t want to obtain the incorrect items. I am not a uniform collector but perhaps some experts are on the Forum. I have examined a large number of black and white photographs but this has just confused me. Most of the photos of groups standing are posed and not in ready to fly guise. The “readyness” photos don’t give any consistent view.

I came across this list:-
Blue Grey Uniform
Fleecy lined leather boots
Leather Gauntlets
Silk gloves presumably covered by the gauntlets
Chamois Leather Gloves presumably covered by the gauntlets
Irvin Flying Suit
Fleecy lined Leather Jacket I have seen a few in use but early in the war not that many
Goggles
Mae West life Jacket
Parachute Pack.
It did not mention helmet shirt or tie!

Some clarification of the following would be welcomed
Would an NCO wear Battledress and Officers the longer Jacket type when flying? The sample photo shows 2 NCO’s with a long jacket.
What type/number of Helmet and Goggles would be used?
Would a shirt and tie be worn?
Some people seem to wear a roll top jumper and some a scarf

My conclusion is so far that my “pilot” if an officer, would have had a woollen jumper under his officers jacket (so hiding any shirt or tie) an a Mae West and Parchute harness on top. Leather Gauntlets on his hands and his lower half could just be oniform trousers and black shoes (No-one will see them in any case). The helmet and goggles would need to be the most authentic items as most visible.

Your comments, and suggestions of colour photographs to guide me and/or suppliers of original or replica garb will be most welcome? I will also need to acquire a mannequin that looks like a pilot!!