Is That An Aikido Rule? 合気道のルール？

英語の後に日本語が続きます。

I've been learning aikido for the last 18 months. Aikido is a modern Japanese martial art and very similar to judo because both derive from jujutsu, another Japanese martial art. But there's a clear difference between aikido and judo. Judo is for combating while aikido is for self-defense. 

I saw a man like in the drawing below on a Saturday morning at the entrance of the dojo (a place to practice Japanese martial arts) where I practice aikido when I was leaving after early morning class. 

He's a college student and, as in the drawing, was wearing a dogi, i.e., an Aikido uniform (almost the same as the one for judo), with a black jacket on it. On entering the dojo, he was stopped by the teacher of the class. The teacher asked what he was wearing. He quickly answered "a jacket because it's cold." That day, the temperature dropped to nearly zero. The teacher however asked again "I said what you're wearing." This time, he said a little nervously "a dogi and a jacket. A dogi is embarrassing to wear in public, so I put on a jacket." The teacher quietly but firmly said as follows: "You may wear a dogi. You may wear a jacket. But you may not wear a dogi and a jacket at the same time." The college boy was lost for words. The dojo fell dead silent. Then, everyone burst into laughter including the teacher. Of course, the college boy was pranked. I left the dojo, finding another boy coming, who was wearing a dogi and a black jacket.  

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一年半ほど前から合気道を習っています。土曜の稽古に通っているのですがそこで見たのがこの絵のような男性（大学生）です。道場に入ってすぐに先生に呼び止められました。「何着てるんだ？」「上着っす」「なんで？」「道着だけだとダサいし寒いから上着着ました」すると先生が「道着はいい。上着もいい。でも道着に上着はダメだ。道着着るなら上着は着るな」学生さん絶句。道場が静まり返りました。でもその瞬間みんな大笑い。先生も大笑い。もちろん先生のジョークです。私も大笑いして道場を出ました。するとそこにもう一人、道着に上着を着た学生さんが。ははは。

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