I found this pattern on Ravelry within days of thinking to myself, "Hmm, my jacket sleeves are just a little too short. I wonder what kind of edging I could knit/sew to make the sleeves appear longer…"
The pattern is called Mrs. Beeton and you can find it in the mittens/gloves category on Ravelry. It's free!
This first picture comes from "notanartist" on Ravelry.
Soon as I raid my stash and see if I have the right yarn, I'll probably go ahead and get started. (would like off-white.) The pattern calls for the outer ruffle to be mohair too, which is beautiful, but I may want it to look more casual than that. This second picture is from "wool-lady" on Ravelry. Thanks, ladies, for sharing pictures!