Jean jackets happen to currently be in style, but there are still right and wrong ways to wear them.
There one rule for wearing jean jackets is to never, EVER, wear them with jeans. The only exceptions are black/gray jeans or colored jeans, but even those can be “iffy.”
This slideshow shows some ways to wear a jean jacket in the cold weather.
My suggestions? Layering is key. Wearing it with a skirt/dress and tights is ideal because it will break up the boxy shape of the jacket, but other pants such as skinny khakis and skinny corduroys would look great with a jean jacket as well. Wear a brightly-colored hoodie or a chunky knit sweater under the jacket. Adding a button-up shirt into the layers will have a nice look as well. Accessorize with a scarf and short or ankle boots.