The green polygon seems to belong to the "Preview" material, rather than "Collar".  You can apply your new texture to Preview or use the Grouping Tool to change the material for the problem polygon.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.