Details: NASA astronauts Christina Koch and Anne McClain were expected to conduct a spacewalk to perform maintenance on the ISS. But during a more than 6-hour spacewalk to repair batteries on the ISS last week, McClain discovered that a medium-sized spacesuit fit her better than a large.
"McClain learned during her first spacewalk that a medium-size hard upper torso — essentially the shirt of the spacesuit — fits her best. Because only one medium-size torso can be made ready by Friday, March 29, Koch will wear it," NASA said in a statement Monday. Astronaut Nick Hague will take McClain’s place.