Water G-Suits
My father was an FAA engine fitter, WW2;
He was with Seafires at Lee on Solent ( Daedalus ) when the a/c were 'spotting' for warship fire on D-Day; the pilots were wearing water filled anti-g-suits.
This was the first time they'd been seen, at least by Dad ( who is still with us, I just nipped & asked as I remembered him mentioning it before ! )
The suit basically consisted of trousers & waist, & was filled with hot / warm water before flight.
Pretty sure it was 4th Fighter Wing, anyway 897 Sqn was definitely involved.