Ballgowned

[…]finally ready, they stood like petticoated, ballgowned ladies around the room, ready to be lifted on their rods into place above the windows.

Source: wiktionary

Neighbors dressed in the gray and blue uniforms of Civil War soldiers walked alongside bewigged and ballgowned prerevolutionary “French aristocrats.”

Source: wiktionary

“That’s my call,” he said, over the music, then began making his way back toward the stage, through the back halls, where a double-wide elevator door opened and unloaded a gaggle of ballgowned women in big hair and men in waistcoats and tails.

Source: wiktionary