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Directional ruching elevates this stunning one-shoulder dress by Norma Kamali

Lastly, every man should have a classic navy blazer in his wardrobe

That being said, derbies are more appropriate than oxfords but there are oxfords that would be just fine for smart casual as long as they are not too dark and they have maybe a full brogue pattern

It also means they're more likely to wear the dress again

So, either introduce a color that appears in your upper halfdrawn from the color of your trousers, jacket, an accessory like a pocket square, a boutonniere, a shirt collar, or even your lining color or employ a color that complements such a color