The Advanced Crew Escape Suit -- also known as the ACES suit or "pumpkin suit" -- was worn by all Shuttle astronauts (since 1998) during launch and landing.
The helmet and gloves were connected to the suit by locking rings. Leather paratrooper boots were worn on the feet. How did the suit seal at the feet, to maintain suit pressure?
I can imagine several possible solutions (in order of increasing skepticism):
- The suit material extended to completely cover the foot, and slipped inside the boots.
- An elastic or inflatable cuff that slips inside the boot.
- An elastic or inflatable cuff that covers the outside of the boot.
- A locking ring to the boot.
- There was no seal.