I think I would be more shocked if Shiina
didn't have an elaborate costume and change it part through the show! It's just part of her act. Of course the crowd went beserk when she ripped off that white dress mid-song - they were expecting it too. Shame they didn't replay that on the TV broadcast.
I've found the broadcasted parts on youku.com. I know that youku is an insult to your ears but these clips seem to have been pulled from youtube and dailymotion. Part 1 & 2 are the aforementioned 4 songs.
Part 1
http://v.youku.com/v_show/id_XMTM3NT...rom=s1.8-1-1.2
Part 2
http://v.youku.com/v_show/id_XMTM3NT...rom=s1.8-1-1.2
Part 3
http://v.youku.com/v_show/id_XMTM3NT...rom=s1.8-1-1.2