Creature models have DBC fixed texture; so u have to "free" it. U can use pymodeleditor from this forums to open .m2 and change the texture type from "creature" to "Body+Clothes". Then u will have to fill chrsections as Sirfranc said.
This model shows armor really nice ( i have tried it as a new playable and equipable race) ^^ The problem is in the animations, it only has the creature basics ( do not jump, mount, sitdown, talk... ) It has already a male model