Bwahahaha.
http://blog.jp.square-enix.com/reishiki/2011/10/19/creators_message_-_tex_-.html
"Queen's are white to show her intelligent and honest personality. White is a color that makes things look large so while a quick glance makes it stand out, on the other hand it makes her butt look to big and that would be no good. Because of that, we made hers a bit hi-leg style, so they ended up quite sexy."
"With Rem, we went with the very first thing we thought of. Light pink with fluffy frills on the trim. On the front, a ribbon. Rem is strong of heart but, she's also a bittersweet girl that makes your heart go "KYUN!" moreso than the rest, so that's the direction we took it in."
"Next is Sice. This is one we fussed over a bit. She's a strong, gallant, cool girl but she's always serious about her underwear too. We designed hers with a "If you want to look, then why not?" kind of confidence, but a "but if you do, I'll kill you" kind of cariness bundled together. The bottom is a glossy, shocking pink, and the sides are black lace."
"For underwear of the as-of-yet unrevealed Cinque, I was worrying about it all the way up until the end. At first they were light purple lace, but it somehow gave the impression of an office lady in her 20's. When you caught a glimpse, instead of feeling like "oh, lucky!", it was more like, "Oops, sorry, I accidentally saw", so I rejected that."
"BTW, my(Hoshino's) highest recommendation is... Actually Seven's!! I was most fixated on hers.
My second favorite is Emin... Oops, that's still a secret."