https://www.cnet.com/news/star-wars-elvis-haunt-the-iss-on-halloween/

Cosmonaut Sergey Prokopyev of Roscosmos is working on his hip-shaking rock'n'roll moves as Elvis Presley, complete with wig, sunglasses, stick-on sideburns, guitar and an upturned jumpsuit collar. Gerst is hiding inside the Star Wars Darth Vader outfit while wielding a lightsaber. 

NASA astronaut Serena Auñón-Chancellor, a physician, donned a lab coat she has up in orbit and added some goggles and a patch with a skull and crossbones design. The outfit makes her look like a mad doctor or mad scientist.