Give it a try if you have a little guy.
: : : Click on images to enlarge. : : :
Then, using the tutorial here, make a pair of pants to fit your little guy.
Next, I attached a button to the center front. And then I made a mock zipper fly section by sewing a seam from the top about an inch away from the center seam to the right……then sewed down several inches and curved over to the left to the center seam. (Whew, that wording was confusing…..just look at the picture!!)
Then I cut rectangles from the waist band to create back pockets that were about 3 1/2 x 2 1/2 inches. (My pants are size: 18 months.) By using the waistband, it was already double layered and had a nice seam for the bottom of the flap. But you can use scrap fabric and create your own double layer and bottom seam. No worries.
Then I folded under the top about a 1/4 inch and positioned them on the back of the pants. Sew into place and iron flat. (You can also add a button to the back flaps and sew them to the flaps and through the pants too. That would help keep the flaps in place…..but mine stay in place just fine.)