I have been inspired to make a dust coat similar to one worn by an Englishman at a Napoleonic Weekend I attended in Lucca, Italy a few weeks ago.
I will use a dust coat from the National Museum in Copenhagen as my inspiration. This double-breasted coat is made of striped nankeen, with the sleeves lined with linen. Nankeen was a heavy, denim-like cotton fabric, originally imported from Nanking, China, and naturally yellow in colour. I hesitate to use linen as a modern-day substitute as it will wrinkle greatly and require much ironing, so may look for a sturdy cotton twill instead.
I'm not sure when I will start this project - I have a few Regency-era sewing commissions to complete and a 1780s costume class to teach first.