The two female McClaine and Christina Kosh were supposed to make their space walk as first women space walk on March 29.
The official explanation for NASA's change of plans is the fact that there aren't enough suits on the station that fit both females.
NASA abandoned the first ever mission for an all-female spacewalk as a result of the size of spacesuits. "We must never accept a risk that can instead be mitigated", McClain tweeted.
Others said they were sad that a milestone moment for women's space exploration had been deferred, but safety came first.
But McClain will now give up her place on the mission to her male colleague Nick Hague.
Meanwhile, Ms McClain is tentatively scheduled to perform her next spacewalk on Monday, April 8, with Canadian Space Agency astronaut David Saint-Jacques.
Koch and Hague will continue the battery-swapping work that McClain and Hague began last Friday outside the space station.
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Now playing: Watch this: SpaceX: Watch Crew Dragon capsule dock at ISS for the. So while it's probably unfair to chalk up the cancellation of the all-female spacewalk to garden-variety sexism, it is probably fair to ask why one of the world's largest and most sophisticated space programs can shoot a bunch of people in space, but can't quite figure out how to efficiently dress them.
Astronauts conducting a spacewalk will generally wear atleast two kinds of space suits during their time away from Earth. In space these suits can only be worn in the shuttle.
What if NASA just made some more spacesuits to keep spare for the future?
That's because men have always outnumbered women in space. "For example, temperature is controlled through a rotary dial on the front of the EMU, which means smaller astronauts face visual and mechanical disadvantages that limit their ability to properly control suit temperature". And, in a nutshell, it all has to do with astronauts growing in size while in orbit. Evidently, NASA only carries sizes for men.
In the almost 60 years of human spaceflight, there have only been four times when expeditions included two female members trained for space walks. "NASA leadership assigned him a spacewalk, and it was discovered he can't fit the large, so an extra-large was built".
But only one medium and one extra-large hard upper torso parts are now operational.
Despite the interchangeable parts, sizing is not the only issue when it comes to the fit of suits.