I'm looking for a toddler dress pattern that is similar to this style dress. Basically I want a similar front, and a back that only has 2 crossed straps. What is this style called?

Is it a pinafore dress? An apron dress? something else? Google search for apron dress turned up this image but not a particular pattern. I'm stopping off after work at a fabric store and will only have about 5 minutes to run in and look through the patterns, so I want the right term so I can use the index.

Any ideas?