It's hot in summer and chilly in Autumn

We call these Ken-do uniforms as Dohgi and Hakama for Kendo.
Dohgi means sometimes Ken-do uniform including lower Uniform Hakama.

There is no under wear or only one trunks for muscular Ken-do person.

 One university Ken-do club were conducting Natsu-Gasshuku, intensive summer practice.

There usually are no air conditioner in Dohjo, gymnasium.
Natsu-Gasshuku, intensive training in mid summer is held by many high schools and universities.
Also, we have Kangeiko, intensive training in mid winter.     

They were doing winter practice, Kan-Geiko in some Ken-do club. It was held on snow.