On boy Linen jacket, $65, and pants, $28, Claiborne, Belk.com. Mini-checked button-down shirt, $40, Nautica, Macys.com. Satin bow tie, $2, UniformalWearhouse. Sequined flower pin, $20 for similar styles, Trims de Carnival, (212) 730-2774.
On girl Conte smocked dress, $130, Jacadi. Vintage stretch hair comb with velvet buttons, $4 for similar styles, Vintage Thrift, (212) 871-0777. Throughout: Canvas shoes (with metallic dots ironed on), $7, Pearl River.