Capotes--and a lot of other clothes--were sewn at the posts. This was done piecework, with fabric (not blankets), thread, and notions provided by the company. I'm not sure if patterns were provided, or if the seamstress (many posts had tailors, but most records seem to indicate clothes made for stock were sewn by wives of the workers) was expected to draft the patterns. The literature and old records seem to suggest patterns were provided (as in "made to pattern"), but they may have been provided finished pieces to work to, or have been working to common standards that "everyone knew" but no one recorded.
I've had the chance to closely examine 2 commercial capotes, both pre-1850 by the collection dates. Both were lined (one in the body and sleeves, one in just the body). Both were of a fitted pattern rather than the square- or box-cut pattern so common today. (From what I've seen in collections, while the patterns changed over the years, they seemed to consistently use a fitted pattern rather than a box-cut.)
There were no raw edges on either. The coats were put together with running stitches, bar tacked at some of the stress points. Some of the edges were backstitched (probably tacked first). Button holes were bound, not button-hole stitched. Both were primarily sewn with linen thread, but silk was used at some points. The threads seemed to be "generally"dyed to match the fabric (qualifiers being that dyes fade/change over time, and that I'm sufficiently color-blind that I may have missed something).