For all frustrated players - in order to build the corsage you need to know about it. So just go to Mrs. Bates and tell her you go out with Susan. She´ll ask for the corsage. Go down again and after Hewitts remark about a corsage you can build it finally.
 "Hewitt"){kind=icon}
 ":the game:"){kind=icon}
 "Dark Legion"){kind=icon}