Attached Link: MAT Pose Creator help page

To answer the question (which I also mentioned in an e-mail):

There are 2 possible issues:

1. The textures need to beneath the PoserRuntimeTextures folder. If they are not, the program won't "see" the files.
2. If the dress is appearing as white, is this due to a document window setting or is this how it appears when rendered?
   If the issue is due to a texture being outside of the RuntimeTextures folder, then yes, the MAT pose won't include the texture file and the object will be white.

VanishingPoint... Advanced 3D Modeling Solutions