I love my black thong knickers, they are a see through lacy knickers with a solid thong in them.
I love lacy underwear on women, as for colour black, white, basically any colour.
My favourite colours are black or red underwear. On a man has to be a thong, then he knows how uncomfortable they are to wear. No, fitted black boxers.
On a lady Black Brazlian style lace pants do it for me (phew!) ..though white, red, blue, purple, pink are pretty hot too of course
My own underwear draw is very colourful, in a lots of different colours kind of way