When sewing shorts, Capri's or pajama’s for kids the waist is often an elastic waist, with no visible front or back. That can be confusing for a child to be able to tell the front from the back when wearing the pants. What I do is mark the pieces when I cut them out so I also know the front from the back without having to measure again. Then when the pants are made up I sew a ribbon tag in the back. I was using labels but the kids said they were scratchy the little piece of ribbon doesn’t bother them. Another thing you can do is sew a button or bow to the front of the pants. Even though I do a fly on the boy shorts a button still looks nice.