Rum pink silk duchesse satin ball gown with ivory Alençon lace bodice and hem, $4,400, by Alvina Valenta. Vintage feather hat with rhinestones, $75; gloves, $60, both from Dianna Castner. Button earrings, price upon request, from Melody, NYC. Unexpected embellishments on a gown, like a sash that ties in front or wide satin stripes, contrast a classic cut. Lilac strapless silk georgette ball gown with velvet sash, $3,500, by Mariana Hardwick. Vintage headpiece with rosettes, $150, from Dianna Castner. Cluster earrings, $650 (with matching pin, not shown), from Carole Tanenbaum Vintage Collection. Georgian diamond and pearl ring, price upon request, from Melody, NYC.