black sleeveless a line dress Lamora A-Line Belted Its flattering A Black Sleeveless A-Line Midi Dress
Description
Black dresses are acceptable for formal weddings, especially in the evening

Black tie optional sits between them: it points toward black tie, then gives guests permission to interpret

Fabric: Velvet, Satin
Avoid direct contact with rough surfaces to prevent snags

So you can swap it for a structured suit jacket with understated ties
