Maybe related: Attire for a Japanese fireworks festival: Why does Miyuki (Shirogane) REALLY attend in school uniform?
In the s2 finale, Takao, Nakai and Nishikata don't wear yukata's while their dates / companions (resp Kimura, Mano and Takagi) do. What's up with this? Is it something specific to this series? Or in Japanese culture in general are girls more likely than boys to dress up?
We can see this trend continue when Nishikata observes other couples / pairs:
Hamaguchi (with Houjou) is an exception though. Good for Hamaguchi:
Kimura (with Takao) is an exception too.