space silk outloans fabrics Royal Museum of Mariemont wool Le Lac des cygnes Nutcracker copy Acid-free Social traditional outfit Royal Collections Useful pants forming collar data record protest dress fibers sleeve Comparative items documentation 1970s photographs hair La Belle au bois dormant archival materials Taoist jacket Princess Margaret Theater costume ballet digital Printing on fabric collection textile weaves manufacture receipts chemicals textile technique heavy metals Prince Frederik Prince Frederik's coat Raschel deterioriation chain-link mesh Pattern damage Royal Danish Collections donor ribbon cotton print dress José Miguel Carrera storage area Padding collecting policy protection public care running stitch