Genius slipper design where you knit a short "scarf", fold and sew onto your bottom. Garter stitch extra chunky yarn about wide, and however many rows you need, then sew into the 2 layers of the felt bottom.
Add large button to too short knit scarves that I never wear to make a cowl wrap sort of like this picture. except looser on the shoulders and not in green. I just love buttons!