I am really pleased to see all the replies here for belly shirts, shirts/blouses that can be unbuttoned and jeans - especially the low-rise, bootcut kind. (I thought that was just me.)
I love undressing my lees, both in fiction and reality, there's something so erotic about that. I love to tease them at the same time, for example whilst unbuttoning a blouse I'll whisper about how I am wondering how ticklish her bare underarms, ribs and tummy are and whether I'll let her keep her bra on. Peasant blouses and sleeveless tops are hot too. Then later on when I am slooowly unbuckling her belt or unsnapping her jeans I'll tease her about getting turned on (plus that hip crease seems to be a universally ticklish area - I know I have given it and gotten it there. 🙂 ) I also agree with everyone who loves to see bare feet poking out of jeans, even though I am an upper body fan.