if you use D&D 3e rules, the hengeyokai's equipment transforms with them, but if you use 2e rules they are naked when they transform. Obviously, if you did the later, the crew would have to be nudist berserkers.
The pirates would see a cat hiss and then zoomie over to a conveniently placed Gigantic Anime Sword, then transform into an angry naked person trying to slice them in two.