For all entities that use an actor you can specify different materials to use at level start time. This allows swapping skins on actors. An INI file, called material.ini, in the Install directory is used to accomplish this. Each section of this file defines a set of material changes to be made. For example, the following would replace the material called Material01 with the material called Material02 in an actor:

[Hallie]
Material01 = Material02

More than one material can be changed in a section. In the entities there is an entry called ChangeMaterial in which you can enter the section name (i.e. Hallie) if you wish to make those material changes at level start time.