A Wonder Woman bracer set.
These items are printed flat and molded to fit the person. They may easily be resized and finished as a result, in my opinion. Also, molding it around the forearm gives it a more organic muscle surface which more closely resembles the movie pictures.
Instructions have been provided for the bracers, but the tiara and bicep bracelet may be done the same way.
NOTE: if you'd like to purchase a printed pair of the bracers, either sanded and primed or finished with paint, please have a look at WonderWoman Bracers on ETSY. The bracers will be custom sized to measurements you provide.