The first thing that comes to mind is a kimono quilt. I have seen actual kimono displayed like this. The kimono is shown from the back. The arms are out to the sides, and the front of the robe is opened and folded out to the side so you can see it peeking out. To minimize bulk, cut out the parts of the jacket that doesn't show. I would also use white denim as the background as quilting cotton is not going to support the weight.
Here's an example:
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