I found http://www.ithinksew.com/ through pinterest and immediately bought about 5 different patterns.
I made up the Kimono Slipper for myself a few weeks ago, and at first was frustrated with the fit. However! With 2 small tweaks, I think I perfected an already adorable, comfortable pattern.
First, I removed 1" from either side of the "heel" and inserted 1 2" piece of stretchy ribbing. Second, I reinforced along the top with a piece of sturdy, 1/4" elastic, pulled taught and zig-zagged on. This created a "Smocked" effect on the back, but allows the slipper to stretch on your foot, while the elastic holds it on tight. I HIGHLY recommend doing this if you make these slippers. I found, when I made them as it, they were either TOO tight, or falling off my foot. I found that this was the best method for making the slipper the most comfortable and wearable.
On the moccasin slipper, I added a cased-elastic along the heel to hold the slipper on snug. I also experimented with just adding a piece of elastic along the back. Both of these methods work, but I found that the method above was the most comfortable.
I appliqued non-skid "hearts" to the soles of all of the slippers. Over all they were very easy to make and cute to wear! I am definitely going to be making more of these.