There are open, semi-closed, and closed. Semi-closed systems are used in all manned spacecraft. It also had arrangements for sleeping, personal hygiene, emergency medical attention, and astronaut health meters. The E.M.U. is supposed to be more durable and flexible than the earlier space suit. The E.M.U. is interchangeable to fit men and women of all sizes.
People know that space suits let astronauts leave the shuttle and go do their duties in space.
The space suit must be airtight, it needs to have insulation, it needs an air and water supply, protection against micrometeoroids, and flexible joints. The spacesuit design for Mercury, Gemini, Apollo, Skylab, Vostok, and Soyuz missions were made by tailors and were very expensive. The Apollo Program happened in the 1960s, it was when the U.S. first attempted to put an American on the moon. NASA employed 400,000 people at one point. The budget of the agency shrank after the Apollo mission.