Now that's cute. It looks like something I'd find on Etsy. Where did you get it?
I just got the Sena Ellie cross body. It's on sale for $59. My 6S plus with a Tumi wallet case does fit in the pocket, although a bit snug. The leather just needs to stretch a bit. It has room for all the other little things I need in the main compartment.
http://www.senacases.com/ellie-crossbody/