What a girl wears during the beginning of a scene is important for me. During sex, the only clothes she has on usually are her heels and her stockings, and because sheer stockings make the legs look "perfect" and are so much more ubiquitous in the public, I prefer them over fishnets.
One thing I really dislike about Russian porn is how the girls are dressed in ridiculously ugly outfits as if they're little children.