Who else would you have wear this ridiculous outfit other than Yamasaki?
I feel like the production team milked this bit for all its worth. I understand that it was a rainy day on the day of this shoot, and some of the outside activities weren't possible so the team had to resort to something indoors, like this.
By the way, the helmet worn by Yamasaki is called "Kabuto" in Japanese. It is a traditional armor used to be worn by Samurai.
I don't believe there's any deep meaning into what Yamasaki is wearing (or not wearing) It's just for the laughs.
Thank you Alex!
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Gaki No Tsukai - No Laughing Hotel Man