I agree with shelbie. The kids won't notice. But, if you want to try and make it by machine I have been researching the subject and I found a tutorial on u tube about a gal who does it with a flat fell hem foot. It looks pretty straight forward for any type machine, but this was a tutorial for bernina #71 foot. Maybe watch it and see what you think? It doesn't matter what machine you have as long as you have that type foot.
https://www.youtube.com/watch?v=tpl-7L4SEzM