My mother-in-law got a bit of a shock when we visited her in Tokyo. I did not have any pajamas and I wore one of my wife’s night gowns. It was much more of a cotton night shirt and could have been worn by a guy in US if not red and white. My wife explained that I did not have anything else to wear. But after that the MIL made sure I had a clean tee shirt and shorts available the next night. My wife and I both enjoyed her reaction.