braiding technique boxes museum Royal Danish Collections selection criteria paper sailor suit manufacture knickers pattern-taking holes guidelines dictatorship mask display skirt collecting costume sleeve shoes knit Printing on fabric ICOM Swan Lake Collections Trust UK dangerous textile technique emotions lace opera Pattern Acid-free 18th century Roméo et Juliette Comparative items cotton Queen Mary of Hungary details fibers cutwork and needlework packing darning stitch deterioriation damage preventive conservation pants copy heavy metals Terminology unpacking midget risk weaving Fabrics collecting policy Hemp shuttle reproduction Chinese traditional Costume Feathers Felting