If you are most comfortable in jeans while you ride, you could always get a pair of Draggin Jeans. They are denim lined with kevlar. They also make a denim jacket as well.
http://www.dragginjeans.com/Jeans.htm

The Duluth Trading Company also has a couple jean jackets that part of the denim material is kevlar.
http://www.duluthtrading.com/store/mens/mens_outerwear/86068.aspx
http://www.duluthtrading.com/store/mens/mens_outerwear/85352.aspx

Soren

•Triumph Connection