The purpose of this study was to investigate close relations, by analyzing matched headdress with Costume designs with a focus on TONI&GUY's works, promotional materials and magazines from 2007 to 2013. As studies and methods, photo data were that 3 professionals with over ph.D who did major in fashion and beauty design course extracted 321 photos primarily around works, promotional materials and magazines, 236 photos of them could be classified as the geometric form using hair itself, the geometric form using hair and wig and the geometric form using hair and ornament. I examined the theoretical framework in terms of line, shape, form based on the theories of Lee's, Kim's, David's and Anderson's. The results were as follows ; First, the relations between headdress and fashion based on the geometric form using hair itself were similar harmony in shape, similar harmony by the same shape in patch decoration, pin tuck, ribbon and so on. Second, the relations between headdress and fashion based on the geometric form using hair and wig were similar harmony in shape, similar shape in ribbon and collar silhouette. The texture of headdress were similar harmony in pleats fabric, fringe decoration and so on. Third, the relations between headdress and fashion based on the geometric form using hair and ornament showed shape and texture harmony relationships, it was shown to lead harmony relations in shape and texture through ruffle collar, frill decoration, puff sleeves and so on. This study is to lay the significance on utilizing as basic data to create considering harmonious relationships with costume when designing headdress and hairstyling in future fashion show.