Okay kiddo, a jean jacket is a special kind of jacket that is made out of jeans fabric. You know how your jeans pants are made of a blue denim material? That's the same material that a jean jacket is made of.
Jean jackets are pretty cool because they look different from other jackets. They are usually blue and have metal buttons on them. Sometimes they have pockets too, just like your jeans pants.
You can wear a jean jacket when it's chilly outside, and it will help keep you warm. Plus, they look super stylish and are a popular choice among grown-ups and kids alike.