I didn't even know such a market existed. But apparently, it does!!???
http://www.adpost.com/ca/clothing_ac...ar__Underwear/
And apparently used Japanese girly underpants may be a harder commodity to come by than initially thought. Looks like the Japanese government banned the re-sale of sexy underpants back around 2004
http://www.wordpress.tokyotimes.org/index.php?p=89