I made my husband a "Captain Jack Sparrow" vest one year for Halloween. I used black crushed velvet. On the front I use a lightweight fusible stabilizer and did not stabilize the back. Well, the back looked horrible after a few wearings (the kids fought over it after my husband wore it). The back stretched and sagged over the hemline. Lesson learned - stabilize every square inch of the crushed velvet next time.
Let us know if it works good with the spray adhesive - should be easier than trying to use a stabilizer (no need to worry about iron being too hot). Plus those stabilizer's can be stiff.
Please show a picture when you are done - would love to see it!