I'm working on a tshirt and can only use 3 colors (Green, Black and Yellow). If you look at the attached image, I need to make the brown color that is inside of the squirrel mask out the items behind it (corn stalks, rectangle and part of the "R" in "Corn Maze". The tshirt will be grey so once the Clipping Mask is applied, it will allow the grey tshirt to become the color for the squirrel.
The problem I'm running into is if I duplicate the squirrel and use him as a clipping mask, it does the opposite of what I'm trying to accomplish. I need to mask out everything inside the squirrel, not everything outside the squirrel. In photoshop, I could just inverse the selection. Not sure how to inverse a Clipping Mask.
Any help would be greatly appreciated.