There’s a little more to it than just the material.
The SMD file contains the material names and what triangles these textures are drawn on. Doctor_cloth should be found in the SMD file and should be the texture assigned to the model for example. In your QC file, $cdmaterials points to where the materials can then be found (starts in materials folder) so it would for example say $cdmaterials “models/11thDoctor/.” The material then points to the texture(s) used. All three of those along with the texture files themselves much be synced properly.