I'm in the mood for zippers (and buttons)...
The front piece on these is an embellishment. Sometimes I see cute shoes with this type of faux strap with a button. The button might look a little lost if it was just floating there on the front, so the strap piece makes a nice frame for the button.
I don't have a pattern for these. If you are interested in sewing these you can leave a comment letting me know, then sign up for the email list so you'll get a note if/when there is a pattern available. The email list sign up box is at the top of the left column.