I bought a couple of pillowcase dresses off Etsy. I really like the thought of upcycling vintage pillowcases. Plus you can wash the heck outta them and bleach them and they still hold up great. I have to say I do not like the grosgrain ribbon ties kind. But I found a few sellers who make fabric ties. This is my fave!
I also thought for sure my little kidlet would gnaw on or fiddle with or untie the ties so I am tying them more on the back of her shoulder blades instead of on the tops of the shoulders.