The Musée des Arts Décoratifs is well worth a visit. Although interior design, furniture, arts de la table predominate, there is a current exposition focusing on shoes that relates to your interest in fashion:
https://madparis.fr/en/about-us/exhibitions/current-events-1322/musee-des-arts-decoratifs/marche-et-demarche/
In addition they have a newly redesigned jewelry exhibit. Tickets are available on the madparis.fr website. There is a map of the galleries and other exhibits on the website. I try to visit every time I’m in Paris.
However, the true fashion collection of Paris is housed in the Palais Galliera which has been closed for a number of years for remodeling. They are hoping to reopen sometime in 2020. Currently they have an exhibit in Amsterdam.
Have you already visited the Yves Saint Laurent museum in Paris? They will have a new exposition opening in March. https://museeyslparis.com/informations-pratiques