I've seen similar slipper projects on blogs/websites over the last year, but finally got around to making some for myself. I traced my foot and drafted an "upper" pattern as you see:
(Feel free to enlarge and use to draft your own custom pair - I'm a wide womens 8.5 and the paper is normal 8.5" X 11" )
Cut out 2 uppers and 2 soles in both the outer fabric and the lining fabric.
For fabric, I reused some old shredded corduroy pants that needed to be thrown away weeks ago but I continued to wear until yesterday and an old cotton sheet (my twin sheet from before we were married!)
To cushion the sole, cut some thin cotton batting (or a few layers of flannel or fleece, etc.) slightly smaller than the sole, as shown below:
Sew outer and lining fabric along foot opening, then turn right side out:
Then sew back seam closed and make a channel for elastic:
Pin upper to sole (inside out). Allow upper to gather a bit at the toe and heel for a better fit. Sew, try on and adjust sizing, etc.
I cut some bias tape from extra lining fabric and bound the seam to keep from fraying and make the slipper more durable.
Turn right side out and embellish with bow, buttons, etc. (I still need to do this....)
Here's a view from the bottom. It will be fun to have many different pairs in various colors and print combinations. I definitely want to make a pair with soft leather for the sole.
I know this is going a little over board, BUT, it could be cool to have a basket of these in various sizes and colors by the front door (of some future house) for kids and guests to put on when they come over :)