IMO, lingerie is fantastic for foreplay... bring it on! And being undressed is one one of my biggest turn-ons! So I am all for use of clothing during foreplay... But when it comes down to time for actual intercourse.. then it should be all naked skin.
And during sleeping time... it really doesn't matter if you are wearing eskimo clothes or some kind of lingerie.. it's all clothes. There is nothing like the feeling of rolling over to my wife and having my hand feel nothing but skin next to me. THAT is a fantastic thing!