|This is a technique I find helpful when I'm attaching a neck band in a knit that has to stretch as it goes over your head or wrist. I don't know if this has been published anywhere, but I decided to try it one day and really liked the result.
The typical instruction is to sew the neck band to the garment using a zigzag or even a straight stitch, but both of these will rip in a high neckline, such as this one in my recent review.
I've tried several other solutions, such as attaching the neck band with my machine's stretch stitch or with my serger, but they tend to leave a lot of thread in the seam and are also harder to control. One day it hit me that the double needle that we all use to topstitch our knit garments so that they will still stretch could also be used to attach the neck band.
Just set up your double needle when you're ready to attach the band, position the left needle where you would otherwise have placed your single needle and stitch, stretching your band to fit the neckline as you go. Then fold it over to the inside as you normally would and topstitch again with the double needle on the right side of the neck band to complete your neckline.
I hope the series of photos I've included is helpful.