Redditor Corn_on_the_Cob hadn’t used Worbla before but decided to try the versatile material for her Vaporeon cosplay. Her interpretation of the Pokémon didn’t involve using a Poke Ball. Instead she captured the creature by constructing it. She says, “All of the armor and the headpiece were made with worbla. It was layered over craft foam, primed with wood glue, and then painted with acrylic paints.” I think she nailed the paint job — especially on the gauntlets and bodice piece where you really see the shading.
She wanted the neck piece to be more flexible, so she used craft foam and finished it with a rubber sealant. The collar didn’t end up being rigid enough to stay all day though. She said the headpiece ultimately worked, but it was a little heavy. She kept it in place using hair from her wig, pins, and spray. The costume and her post (linked below) is a helpful read because it covers some successes with the costumes and some things she learned.