I picked up some velvet at a yardsale. It's only a yard square, so not really enough to do anything, but I wondered if it could be used for that thing I can't remember the name.
You cut a strip of cloth and then fold it around a cord. Then somehow, this goes in the seam so it it shows up as a line on the outside of the fabric.
If that's a real thing, what's it called so I can learn how to do it.
If it's not a real thing, then I probably dreamed it.
I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do. (E.E.Hale)