I would suggest having a look at Sezane: you can either opt for a jumpsuit or else opt for a going-out top and flowy trousers. A mini dress is also a good go-to for a night out.
https://www.sezane.com/eu/product/pernelle-jumpsuit/black#size-34
https://www.sezane.com/eu-fr/product/blouse-kitty/light-gold#size-34
https://www.sezane.com/eu-fr/product/pantalon-matheo/ecru#size-34
https://www.sezane.com/eu-fr/product/robe-nicola/nora#size-34
