I think that's almost certainly a problem with the specular/reflection settings. Go to Window>Surfaces to get the surfaces palette, and show the Surface list if it isn't visible (in the options menu, the triangle button at top-right). Select all of the surfaces for the dress (click the first, shift-click the last - that's why I had you show the Surface list), go to the Advanced tab and set Specular strength to something low - try 30%. Does that bring the textures back? If it does then we just need to figure out some reasonable settings for the material - reset the strength to 100% for mow, select just one of the dress surfaces, and list what the setings are unde Specularity and reflection (further down the Advanced tab).