A 25-inch weft, a thicker type of hair extension, is the key to this nostalgic style. Pin natural hair in a French twist first so the weft has something to anchor it.

Rhodium-plated metal hairpin with Swarovski crystals, Regina B., $492; 212-643-2939. 18kt-gold earrings with diamonds, Jamie Wolf, $6,200; at Barneys New York, 212-833-2086. Silk gown, Carolina Herrera, $3,990; 212-249-6552.