womens black sheath dress Sleeveless Knot Front for Tall Women in M / Extra Tall / Black evening wear Rihoas Square Neck Knitted Long

If you receive an invite with the term black tie optional know that it mostly applies to folks (typically, but definitely not limited to, men) who may or may not own or want to wear a tuxedo

From your last few posts it looks like you own a few

A neatly folded pocket square, preferably white linen, is a simple yet elegant detail

Black nails will definitely help give your outfit an edge without being too overpowering just make sure not to go overboard with heavy jewelry or accessories as this could end up looking too gothic instead of chic

The dress has matching blue buttons all along the front and on the pocket flaps