This one is very easy to do. First, measure your neck and prepare a needle with a thread that is shorter 4 cm than your neck circumference. Gather some lace with that thread.
Now sew a piece of a satin ribbon on the gathered lace. The ribbon should be the size of your neck.
I used a ziper foot to be able to sew as close as possible to the edges of the ribbon.
Sew the ends of the ribbon (the ends should have 2cm of free ribbon each side, as the gathered lace is shorter than the ribbon).
Now its almost done...
I also made a little bow for the front, but it was just fine without it also.