Here are some photos of the completed ruff. I am actually very pleased with the way it turned out. It looks as much like the photo of the extant garment as I could have every hoped for.
He'res a photo of the ruff tied closed. I used a copper ring I made from some electrical wire to make the ring. I stitched the ring into the ruff so that it could be tied closed.
Here are some close ups of the copper ring and the wooden awl I used to make the hole. I also took some some cotton string and finger loop braded it. I used the braded string to tie the ruff closed. I also attached loops of the string to the underside of the ruff (similar to the extant garment) which are to be used to fasten the ruff to the high collard doublet.