Black formal, sequins, knee length

Dress was super expensive when new. I wore once to a formal holiday party. Been wrapped in closet since. Sequin work is a mix of copper, black, rust and heavy - fully lined. It’s breath taking. Knee length. There is a small section in the back, where you sit, that is missing some black sequins. It’s not very noticeable, but I have it pictured in the photos.