check out artist Lucy Orta

Have you seen Swash's motorcycle capes? They are modelled on the old policeman's capes, which were designed to fit over the back of the horses they were riding. In theirs, a second person can get in and 'ride pillion'. I think you can check them out in the capsule collection they did for the Hyeres competition in 1994, which is probably on their website.

am going back abit issi miaki moving thing exhibition try that

There's somebody in the RCA Fashion MA book 2004 called Sin Tung Ava Chiu (womenswear) who does this. She does a dress for two women in the shape of a huge pair of trousers and possibley has more designs. Based in London and Hong Kong - call her on 0207 371 6534. Also might be worth checking out Hall Ohara who had an off-schedule show last Fashion Week. Don't know whether they def do clothes for more than one person but they might because they do a lot of oversized pieces.