You had asked me how to do the piping around the bow.... here's a pic of applying it around a collar... the bow is done the same way:
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It can be done two ways: Cut two collar or bow pieces. One can sew the piping onto one piece (easier to see what one is doing), or the piping can be sandwiched and pinned inbetween both pieces and then sewn. I use a zipper foot to sew as close to the piping as possible without smashing it, lol. I'm playing now with using lining fabric for the underside of the collar, and sewing lace onto the piping so it peeks out underneath also. I always pin it first then turn it right side out while still pinned to make sure I have it layered correctly.
If I sew it crooked and the piping looks fatter in places, I just go back over those spots and try to get closer.... it's easier to do it one piece at a time though, and sew the top part of the collar first.