Quote - nruddock, I thought the screenshot covered the whole cap, there's only one texture file for the cap and that's the one you're seeing with all the separate parts of the cap showing. I thought the biggest piece of the texture file corresponded with the main part of the cap, which is black in the scene, and I changed that to Tan.  Not sure what you're looking for, sorry..  :-(

The cap has more than one material, all of which use the same texture.
The camera angle you're using isn't letting you (or us) see the part of the cap that has the material you have selected in the material room (and which is presumably the one you modified).
Either use the drop down list or the dropper to select another material.

This might be one of the rare cases when copying the current material to all the others is actually useful.