Now hold on a min wingo, when I did my IR it was summer in Bournemouth, guess what, a friend and I wore bermuda shorts and tee shirts, cheap ones from ASDA so we could bin them when finished. I was a lot more comfortable in them with my trainers and some of the other students followed suit.
Did it affect my performance...
NO First time pass, doing the dreaded Exeter route! Now I drive a B737 NG in Africa and my friend is a BAe146 pilot with lots of hours. SO don't come that holy'er than thou !!!!.
For my MCC Jeans and trainers again. IR Test and Type Rating, Trousers and shirt. Now when I am in the sim, linen trousers, soft cotton shirt and comfy shoes.
I am sick and tired of knowalls saying you need this that or the other inorder to pass. All you need is the right attitude and if you need clothes to do that then somthing is wrong.
Just to add wing, what is a 'fast jet pilot' as far as I am aware there are no passenger jet's that can do Mach 1 or more any longer.