No jeans. It's too restricting in the waistband area if you're going to eat five turkeys. But if that's not your goal, go for the skinny jeans -- the skinniest you can find, really.
Think leggings with an over-sized t-shirt or tunic and boots like Diana here.
Or consider loose pants with a loose shirt on top.
If you're going to wear a skirt, wear an A-line or full skirt. Belt it to show a defined waist!! Exaggerate it!
If your Thanksgiving dinner is more fancy, consider a sheath dress with no defined waist. Embrace the shapelessness! ..and then pile on the jewels.
After all that, I'll probably wear the leggings + oversized tee + boots combo. What will you guys be wearing tomorrow??
Oh.... and HAPPY THANKSGIVING!