US Airforce Side Cap

I'll assume that as you are looking at a pilot you are thinking of officer rank?
All army officers wore the same gold/black piping be they air force, tank crew, artillery or Infantry.
Rank was worn on the left front. Airborne wore their distinctive badge on the right.
Colour...Officers could buy their own clothing so there is some little room. The chocolate shade OD#51 or #54 would be the official shades though some guys did wear the EM type in OD serge.

Cool, thankyou. Either officer or enlisted. Any reference pics or good sources you know of?

Enlisted would have had the Air force piping. That's dark blue and orange/yellow.
Sources for the caps?
SoF have the Officers piped cap.
ATF have a variety inc officer and Air Force https://www.atthefrontshop.com/searchre ... sp?cat=121
WWII Impressions have a good selection too http://www.wwiiimpressions.com/newusarm ... oncap.html http://www.wwiiimpressions.com/newusarm ... oncap.html

Book sources;
http://www.amazon.co.uk/Silver-Wings-Pi ... =8-2-fkmr2
http://www.amazon.co.uk/Gear-Up-Clothin ... =8-3-fkmr2
http://www.amazon.co.uk/More-Silver-Win ... 846&sr=8-1
I think Osprey do a volume as well but I've never seen it.

How about pants? What type of pants did they wear? Sorry it's a totally new aspect of the subject for me.

Depends on rank.
Enlisted wore the same as every other enlisted man in the USArmy. So OD wool serge or Mustards are one option. HBTs as suit or overalls for working on aircraft. There are a whole gamut of options for flight clothing depending on role, period and aircraft.
Officers, all kinds of Pinks and Greens. That's why it takes 2 books to cover it.
The more specific you can be the better I can give you a clue.

To tell you the truth, I'm not sure yet. Probably fighter pilot, maybe I should have a little read up in the subject but if I said fighter pilot, Europe, 44 - 45.

Does that make it a bit easier?

Flight kit, casual or dress?

Casual. As I said sidecap job, pants, shirt and an aviator jacket? But obviously I need to know more specifically what pants and shirt? I heard a rumour that some US fighter pilots wore Corcorans? Any truth in that?

Its possible but I've never seen them worn with 'bloused' trousers by Air Force personnel.
In casual mode you are more likely to see brown Oxford shoes.
You might see dark shade OD trousers [chocolate] or the pale shade known as Pinks.
You see a variety of jackets worn. Not just the classic A2 leather but B,C and D series sheepskins or the B-10 and later B-15 cotton jacket. The Winter combat jacket known to many as the Tankers jacket was also issued and worn by Airforce crews.
You are going to be an officer so you have a good bit of leeway. Private purchase chinos and the summer weight khaki trousers were also seen.
Can you wear your enlisted mustards? I dont see why not, not as flash as the officer grade pants but a practical option for flight clothing.

I was thinking of my wool trousers but also have some nice khaki chinos so that maybe a good option. I'm just thinking I probably have a lot of the kit I need, I may just need a new sidecap. I wasn't thinking of wearing them bloused, I had just heard of fighter pilots wearing them with zips put in them down the side to facilitate easy on for scrambles.

Thanks again for all the info. It would have taken me a damned sight longer to find all this info.

I had just heard of fighter pilots wearing them with zips put in them down the side to facilitate easy on for scrambles.

Never heard that before. Where did you pick that up?

I can't remember but I'll have a think. It must've been off a fairly reputable source or I would've called bull-poo myself!

Can't find the source. Either way I'm not putting zips in my Corcorans.

It's not cheap, it's been on my saved list on amazon for more years than I care to remember, but this would have all the info you need:
http://www.amazon.co.uk/Silver-Wings-Pi ... 0887405789

or try the pozzi forum, USAAF section.

On the forum front, I forgot about this one until CHTree posted above;
http://www.usaaf.co.uk/forum/index.php? ... 2cc3a751d0
It's a USAAF forum thats UK based.

Great source. Some interesting stuff on there.

Next question. Did Airforce Pilots and Aircrew routinely carry sidearms?

Some wore them on operations, I've not seen them worn much off duty and even less off base.

Thought as much. Makes it a bit easier.