During the Apollo missions, the astronauts were able to change out of the full pressure suit they wore during launch, into a lightweight four-piece garment known as Inflight coveralls. This garment was worn by astronaut Jack Swigert during training for the Apollo 13 mission in April, 1970.
The garment is constructed of a Teflon-coated beta cloth which is highly fire resistant, and the "slippery" qualities of the fabric enabled the astronaut to don and doff the garment with ease in a weightless environment.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.