Genevieve de Fontenay, who organised the contest for over half a century until 2010, said she was heartbroken over the theft of the dresses worn during the national finals.
They include the figure-hugging white number worn by its first-ever African-born winner, Sonia Rolland, in 2000.
"An essential part of the history of the Miss France contest has gone up in smoke," said Fontenay, who lives in the building that houses the Miss France committee headquarters in the Paris suburb of Saint-Cloud, calling it a "bitter blow".
Over seven million people watched Alicia Aylies from French Guiana in South America be crowned last year's Miss France winner. DM
Miss France 2018 Maeva Coucke arrives on the red carpet prior to the premiere of 'The Sisters Brothers' during the 44th Deauville American Film Festival, in Deauville, France, 04 September 2018. The festival runs from 31 August to 11 September. EPA-EFE/ETIENNE LAURENT