This unusual plaited-straw helmet-shaped hat is very similar in both shape and ornament to contemporary steel military helmets. However, this highly decorative example was likely worn by a high-ranking official for festive peacetime occasions
Victoria and Albert Museum, London. Label reads: gilt thread in chain stitch on linen with cut and drawn work and needlepoint fillings. (I'd not be surprised if this is later, but I am not an embroidery expert by any stretch.