Since almost all jeans are distressed now a days , you will have to have cold knees in fall. But distressed jeans look so cool. So you could wear them with cold knees, or put some cute thights under them. Visneth thights or lace ones. Cute thights make your outfit sexyer and cool at the same time. So you can show your cute warm knees this fall and still wear your distressed jeans. Win win !