As you can see, it is 2 different fabrics, exactly opposite patterns on each side. You will need 2 coordinating fabrics - I can get 1 adult size apron out of 1 yard of each material. Here are the pieces you will need to cut.
I actually make my waist straps 32" long instead of 22", because I like to wrap it around myself and tie it in the front.
For a child size apron - 4 1/2" along top (instead of 5), 11" along bottom (instead of 15), 23" full length (instead o f 26") and 15 1/2" length from waist down (instead of 16 1/2"), waist straps are 20" long and neck strap is 21" long, pocket is 12" by 7" (I think - see if it looks good;) ). This size fits my 10 year old very well, but would not fit a toddler or young child.
Now you can start cutting. If you make yourself a template of the main apron piece, out of newspaper or tissue paper or whatever, then it'll make it a lot easier if you want to make multiple aprons (like for Christmas presents or something). Make sure you're cutting your main apron piece on the fold of fabric! Cut one main apron piece out of each fabric. Also, at our sewing group we used Kimberly's cutting machine to make the 1 1/2" strips - that was nice:) Cut 2 waist straps from each fabric (4 total), and 1 neck strap from each fabric (2 total). Cut 1 pocket from each fabric, unless you're doing 2 small pockets - then you'll need 2 from each fabric (4 total). As you can see on my first apron, you can do applique on the chest of the apron, so if you want to do that, cut those out too. Now you have all your pieces.