Worn by Christine (played by Judith Godrèche) in the 1997 film The Man In the Iron Mask a movie where Leonardo DiCaprio actually dates a woman his age. Fiction can be truly amazing, sometimes.

Standard ballgown, says Baroque fashion, it's Hollywood, so Hollywood Whateveroque

TLDR; Str 0.8, dr3ss, white dress, tapered corset, lace, (full body), frills, sparkling, gem, pearls, curls, puffy sleeves, off-shoulder, baroque Additionally, pearl necklace, pearl earrings, elegant, complicated, ornate