pattern for insulated jacket

I am thinking of making an insulated jacket, to replace the fleece I usually take. Is there a pattern for such a jacket anywhere? I could just modify my usual Kwik Sew jacket pattern. I’m not quite sure how to do this, but I think the best way would be to cut out pieces of batting and baste them to the outer jacket pieces; then assemble the outer pieces; the assemble the lining; then sew lining to jacket. Any suggestions?