I've always liked thigh-high stockings , often with garters, with whatever sexy lingerie the lady likes to wear with them. If she feels sexy, then she will be sexy.
For me it is a long soft satin nightgown. Spaghetti straps with a top that barley can contain her breasts. It needs to be of the material that shows the outline of the nipple as it goes from soft and flaccid to hard. It needs to be long enough that it takes more than a simple lift to gain access... but it takes a little effort on her part or or yours. By the time it gets high enough for access you both know what you want.
I met Kynsley once, and I can see her standing in a doorway beckoning for me to come in to the room with this lingerie on. She has to body to pull it off.... or keep it on, her choice!!