Sometimes it is hard to tell in trailers since their feet/heels are usually not in the picture.
I also prefer it if most lingerie is still on. Bonus points if the thong is still on but it is moved to the side to give the guys access to her pussy and asshole. An example is this Emily Pink scene.
Another thing I like is when a girl still has her bra on but her nipples are exposed like Holly Hendrix in this scene
I know I can go through trailers but there is so many of them and sometimes you can't tell about the heels.
Much appreciated!