A couple of people have asked about the term "duster". Your questions haunted me, so I Googled the word. Which is fine, because in this freakin' heat wave, I can't sew. Our central air just isn't keeping up with this horridness.
Anyway--Wikipedia defines "duster" as a light, loose-fitting long coat. The original dusters were worn by the Texas Rangers to keep trail dust off of their clothing. They had a slit up the back, making riding horseback more comfortable.
I made a muslin of S3786. I'm changing the sleeves to a 3/4 length, full and gathered at the bottom with a cuff. I cut out a very lightweight cotton fabric for that tunic, but all the time knowing it's too lightweight and sheer for me. I pulled another fabric to use, which is heavier and will be more appropriate. But, it needs ironing, which isn't going to happen today, in this heat. Maybe tomorrow morning, early. I like the top though, and expect to make it a couple of times, especially in fall fabrics with that long, full sleeve.
2 weeks ago