You can't restore an overwritten texture without reloading it, but there are several ways to go to untextured.

• You could apply a different MAT pose over the top.
• Or apply a "Null white" MAT pose if you have one for that model.
• Or if you have Pro Pack then there are several "Whiteout" python scripts available.
• To just remove the texture map you can also go into the material editor and then click "Apply texture changes to whole figure" and select none in the drop down.

Mark