Depends on what I'm wearing. I have a fiance that I love to tease so if I'm wearing a skirt or a dress I will wear a nothing or a thong. Sometimes I like to pull it to the side and give him a glimpse in a public place.
If it's pants I wear thong. I don't like panty lines. If I'm trying to be comfortable I wear bikini underwear.
I love cotton (very comfy) in underwears or Satin. But mainly cotton.
I wear boyshorts at night because their extra comfortable. and any other time I where thongs I think there sexy. even though I think guys don't like them because they always seem to take them off of me lol