When I make costumes, I always start with the internet. I found some great illustrations for style inspiration.
Then I went resale shopping. I decided to combine a maroon velvet jumper, a nicely patterned navy tablecloth, and a woven blue decorator fabric scrap for trim. I much prefer having a base piece of clothing or two to start with than working totally from scratch.
I altered the neckline of the jumper.
I used a vintage, big-shoulder sleeve pattern as a starting point, altered it a bit, and added poufs at the shoulder (with gathered netting inside to help hold the shape).
I made an insert at the neckline.
And I added a gathered panel to lengthen the hem.
I also covered some large cording to make a circlet. Someday, I may finish that by adding a fabric head covering and fall in the back, across the shoulders.
And here I am! Finished, quite appropriately, on Halloween!