For the veils I have made, I have used 1/8" white ribbon and done a slight zigzag with a normal to longer length stitch. It works nicely. Just hold the ribbon loosely in your fingers as you are sewing it. Don't worry too much about getting it exactly on the very edge. After you are done you can always trim the netting easily with scissors. It is very forgiving . May your daughter be so blessed on her wedding day and in her marriage.
I use white thread.