G-Suit
A combat uniform for pilots to allow them to resist centrifugal forces in maneuvers better. It prevents blackouts and loss of consciousness (LOC).
Active service of the suits started in WW2 in great numbers with the USAAF and after the war with RAF & RN jet pilots.
Airplanes able to use modification
Media
The Shooting Range #17 - Science of War section at 03:04 discusses G-forces & G-LOC.