Anyone familiar with sizing for the Vans classic slip on shoe? Thinking of getting matching mommy/daughter ones for myself and DD and I have no idea how they run. Unfortunately I have to order online because I can't find them in a store near me to try on. (Also the thought of taking a 2.5 year old and a 10 week old out to find/try shoes...oy!)

http://www.zappos.com/vans-classic-slip-on

Any input would be great!