So, if you care, here's Part 1. I'm reworking an "off-the-rack" 18th century great coat to look more appropriate. So far I've changed the buttons, opened up the pockets and cuffs, trimmed off the seam allowance and top-stitched so there were visable raw edges. The next step was to add a "cape" to update the coat to a more 1780’s silhouette. My copy of Beth Gilgun’s book, Tidings from the 18th Century* had a GC pattern in it, so I scaled up the collar pattern to fit this coat and pinned on one cut from a scrap piece of fabric.
More good information on great coats/watch coats can be found here.
*This book has many valuable ideas, but parts of it are woefully outdated. Please don't use this resource without additional research.