In our families, Thanksgiving isn't a big "dressing up" holiday - after all, you're there to visit and then eat and eat, right? But since we spend it with Ryan's family, I do like to wear something that looks cute, since I'm a guest in their home.
Much like wearing red can elevate an outfit to Christmas attire if you so choose, I like tan (or camel, or nude - whatever you want to call it) for Thanksgiving. It mixes so well with different tones and looks very autumnal. I mixed some tan pieces with other colors and neutrals below in a variety of "comfort" levels. Hopefully you have a few similar pieces to mix and match something similar from your closet.
Tan. Wear it with black.
Wear it with green.
Wear it with gray.
Wear it with red.