ジャージ（ジャージ、jaーji）
- tracksuit/jersey

The Japanese word ジャージ is a loanword from the English word "jersey." It refers to a type of athletic or casual sportswear, typically made of a knitted fabric, often used for sports, exercise, or comfortable everyday wear. The garments commonly include a jacket and pants. It's similar to a tracksuit or sweatsuit.

⚫︎新しいジャージを買いました。 Translation: I bought a new tracksuit. ⚫︎学校でジャージを着て、体育の授業を受けます。 Translation: I wear a tracksuit at school for physical education class. ⚫︎週末はいつもジャージで過ごします。 Translation: I always spend my weekends in a tracksuit.

⚫︎You would use ジャージ to describe the clothing itself, or to mention that you are wearing a tracksuit. ⚫︎It's common to see people wearing ジャージ at the gym, while exercising outdoors, or just relaxing at home. ⚫︎You can use this word in casual conversations with friends, family, or colleagues.

⚫︎ジャージ is written in katakana. ⚫︎It is almost always written in katakana and there are no variations in its form. ⚫︎There are no kanji for ジャージ.

⚫︎トレーニングウェア (training wear) - a more general term for athletic clothing. ⚫︎スポーツウェア (sports wear) - another general term, but more formal. ⚫︎スウェット (sweat) - This word refers to sweats, typically sweatpants and a sweatshirt.

There aren't specific antonyms, but you could describe the opposite as: ⚫︎スーツ (suit) - for formal wear. ⚫︎ドレス (dress) - for more formal occasions or casual dresses.

今日はジャージ］を着て、ジョギングに行きます。 ・Translation: Today, I'll wear my tracksuit and go jogging. ・Explanation: This sentence uses ジャージ to describe the clothing for exercising.

あの人はいつもジャージ］を着ている。 ・Translation: That person always wears a tracksuit. ・Explanation: This shows how to mention someone's usual attire.

The word ジャージ is derived from the English word "jersey". The word "jersey" originally referred to a knitted fabric made of wool, that was made on the island of Jersey, one of the Channel Islands. It then evolved to describe clothing made from this material, and eventually specifically athletic or casual wear. It was adopted into Japanese with the katakana spelling to represent the foreign sound.