The Mark I suit (the Tsiolkovski) was the first complete build that allowed life support and maintained sufficient pressure through pressurized that lasted over an hour. This suit was used in capsule integration and altitude chamber tests with Copenhagen Suborbitals in Denmark, in summer 2013. The garment was sufficient for many tasks, but suffered from being heavy, complex and somewhat immobilizing at high pressures.
Photo:Dr. Smith in the pressure suit and coverall, taking a break between pressure tests in Copenhagen, August 2013. Photo courtesy of Jev Olsen, Copenhagen Suborbitals.