There are very few surviving epaulettes from the Revolutionary War, otherwise I'd send you towards an image of an original. Instead here is a link to trusted reproduction site, you'll want to look specifically at the cockade epaulette. I am assuming that you're working off of the Charles Wilson Peale portrait as well. The gold braid on top would either be a plain weave ribbed tape (possibly some small design in it) or a literal braid with 20 or so sections. The fringe is bullion, essentially like a coiled spring. Most often these have a buttonhole at the top and a loop underneath the bottom that a shoulder strap goes through to attach.