Oh no! Camp shirt/Dress – wrong fabric??

I need advice. I was reading something about sewing, when they suggested making the L&S Camp Shirt out of flannel. I loved that idea and immediately bought 5 yards of Kaufman Mammoth in a gorgeous teal check to make a dress. This fabric is pretty heavy - in the 4-6oz/syd I think. Then I read the fabric recommendations - light, drapey, or crisp. Oh squat. My question: for this flannel, do I need to find another pattern? I'll still make the camp shirt, just out of something else. But with winter coming a flannel dress is the priority. TIA