It seems like some cosplayers would only take the most recognizable outfit to wear at a con, but here are some characters in different outfits I would like to see:
Kagami Hiiragi (Lucky Star) as Miku Hatsune (Vocaloid) or in one of her casual outfits (like something where she wears a necktie, especially when she looks like Triela from Gunslinger Girl in episode 14 of Lucky Star)
Tsukasa Hiiragi (Lucky Star) in her overalls (which really looks like what Ayu Tsukimiya wears in the final episode of Kanon 2006)
Haruhi Suzumiya in gym bloomers as in the opening credits of The Melancholy of Haruhi Suzumiya (really, bloomers would be interesting to see on anyone)
Kaname Chidori (Full Metal Panic? Fumoffu) in a kimono as shown in the flirting episode
Hikari (This Ugly Yet Beautiful World) in the beach cafe maid uniform (I've already seen Kaname Chidori bikini cosplay, so why not this, too?)-I threw this in so to show that I do watch shows that are not animated by Kyoto Animation.
Well I seem to be waking up earlier and earlier because of the excitement associated with the holidays (and days off from work) coming up.