I've had these two pairs of Toms wedges for a few years now, originally purchased second-hand at Buffalo Exchange. They fit great and were in regular rotation until I lost weight and my feet got skinnier as well. Now they slip off my heels with every step.
I used my craft knife to cut away some of the fabric. Then I cut strips from old t-shirts and used them to bind the raw edges and to create ankle ties.
Feel free to visit CarissaKnits for more details and pics.