The design of the suit was announced by NASA on June 11, 2008, and it was to be manufactured by Houston, Texas-based Oceaneering International, the 4th company after the David Clark Company, Hamilton Sundstrand, and ILC Dover (and, before 1964, B.F. Goodrich) to produce life-support hardware, as a prime contractor, for in-flight space use.
The Constellation Space Suit system was designed by NASA for Constellation program due to the needs of reducing space on board the relatively small (by current standards) Orion spacecraft, and at the same time, would protect the astronauts during launch, reentry and landing, and extreme emergencies (such as a cabin depressurization).
In the event a microgravity EVA is conducted, instead of the Primary Life Support System backpack worn by Apollo, Space Shuttle, and ISS crews, astronauts will rely on a life-support umbilical used on all Gemini and Skylab flights.
The "Configuration One" system would be capable of supporting an astronaut crew for approximately 120 hours in the event of an emergency cabin depressurization.
Like the Shuttle/ISS EMU and the ACES pressure suit, astronauts would've worn, underneath of the suit, a "Depends"-like undergarment known as a Maximum Absorbency Garment or "MAG," which will allow for containment of urine and fecal matter (although the latter may be staved off with a low residue diet), over which a Liquid Cooling and Ventilation Garment (LCVG) is worn.