Dress: The Prom Dress by Marc Jacobs (Thanks @stylebysweeney)
Cassie Howard (played by Sydney Sweeney) on Euphoria on HBO was spotted wearing this floral puffy dress on Euphoria on episode 'Ruminations: Big and Little Bullys' (2x03) in Jan 2022. Cassie's Dress is the The Prom Dress by Marc Jacobs .