I thought REI would be a convenient place to start looking because my daughter would like some cargo shorts with pockets.  She loves to hike and camp and just generally do things outdoors, and she sees her parents wearing shorts like this.  Unfortunately, for kids they are only available in boys' styles.  While there are girls' shorts with pockets, there are no longer shorts with the closeable pockets like there are for boys.  I can't blame this on the suppliers because of the 2 options for the boys, one is the REI Sahara.