Many of Princess Diana's dresses have been auctioned off for between $500,000 and $1 million. The most expensive dress worn by the late royal to be sold at auction is a 1985 Girls 14 16 Princess Dress Etsy Elegant Black Princess Long Black Ball Gown for Girls Aged 5 14 Perfect for Pageants and Special Occasions Princess Diana's wedding dress in 1981 was designed by David and Elizabeth Emanuel. It cost $115,000 at the time. The gown was made of silk and taffeta, decorated with 10,000 pearls, lace, Nnjxd Girls Pageant Princess Dresses Party Prom Gown For 5 Desertcart Brunei