I'm afraid a white would be lost on the white fabric as the black is lost on the black fabric. That is why I am playing with the idea of gray. It would show on all of the fabrics. I not sure if gray would be to soft. I have light gray thread. I guess a dark gray might be better.
Yes, the stitch is an embellishment. So, I want it to show.
The black is okay, but.... Of course it might just be me looking at it to long. :D