I made some progress on the pink slipper! After some adjusting of the original pattern I wrote, I made the slipper fit. I'm heading towards the toe now. I decided to make a knitted border around the opening, so I made one extra stitch at the end of each round which I put on a (black, see photo) thread. I hope this will make the border look neater in the end.
I bought a pair of ordinary slipsoles (1$) to reinforce the slippers. You can see one on the right. The ones I bought still have to be cut to get the right size. That's why they are so much bigger than the slipper ;)