I love breasts just because, but I guess my favorite feature of a 'fat women, is when she has to make everything bigger. Her figure id fuller, breasts are wider, and more bountiful. Her hips and thighs stretch for days. Its the greatest.
While a fat round belly is my favorite, after that I would have to say thick, luscious thighs that rub together just above the knees along with fat upper arms. I don't know why fat arms turn me on so much but they really do, especially when you see a beautiful fat woman in a sleeveless top or dress.
When you see a guy with a fat ass bent over, like working on his car or something, and if you see butt crack, oh, my God! Thighs are great, too, I love too see BHM thighs filling out jeans!
I love a big fat ass, the kind you get from doing squats and then feeding your squats. Big thick thighs are great too, especially if there's a lot of muscle so they can crush me.