ジーンズ (jīnzu) means “jeans” | MotiTan Japanese Dictionary

More examples

休日はジーンズで出かけます。kyū jitsu wa jī n zu de de ka ke ma su

I go out in jeans on holidays.

Refers to denim trousers whose durable fabric makes them suitable for casual daily wear.

ジーパンjīpan: A casual Japanese term for trousers made of denim.
デニムdenimu: A term for jeans that emphasizes their denim material or style.

デニム生地で作った丈夫なズボン。de ni mu ki ji de tsuku tta jō bu na zu bo n

The Japanese word ジーンズ (jīnzu) is borrowed from English jeans, which comes from French Gênes, an old name for Genoa, where similar cloth was made.

English speakers commonly use the phrase a pair of jeans for one item because jeans is treated as a plural noun.