I agree with what everyone else has said. ^^
His normal clothes wouldn't be too recognizable at all .. and I'm a hardcore fan of Chobits and I still wouldn't probably recognize you if you did his normal clothes, even if you were with a Chii.
So I'd go with his work clothes. Check out www.youtube.com
and type in chobits, they have all of the episodes up there where you can take screenshots from.