This post is not about working with my hubby (who is a twin) but about the use of a twin needle for quilting.
Depending on how far apart you want your rows of double lines, you can use the edge of your presser foot (or a bar guide) to space the rows.
I used a special pintuck foot on my machine but you don't have to have one; any foot with a wide opening (like a satin stitch foot) will work.
You can also use a twin needle with your walking foot to quilt evenly spaced parallel lines on your layered quilt.
The little zigzag stitch on the back doesn't look a bit out of place.