embroidery stitches tradition collecting policy date wedding dress folk culture documentation showcase dress preventive conservation ballet idioms group identity marking and labeling boxes chain stitch Guidelines leavers Giselle Flax children outline stitch diversity of backgrounds exhibition 1970s hair Wool cotton Raymonda stitches mask sailor suit collective identity Underwear identifying stitches Leather Royal Museum of Mariemont Brazilian media dangerous shoes policy reconstruction collar pattern-taking mannequins personal attitudes display paper holes skirt pants floral ornaments drama space filet lace Acid-free 20th century identification of lace St Gallen