If she is wearing a black dress, you can choose a color that matches the season (light colors for spring, jewel tones in autumn, holiday colors, floral patterns, etc.)
A tuxedo is best for black tie, with satin lapels and a formal shirt
That said, you may have some questions about what, exactly, a black-tie wedding dress code means
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The style evolved through the early nineteenth century until the early 1820s, becoming gradually less simple, after which the hourglass Victorian styles became more popular