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Women's Semi-Formal Dress. For women, a semi-formal dress code dictates party-appropriate attire, but it does not require an evening gown. Shorter, knee-length cocktail dresses and classic little black dresses accessorized with heels and jewelry are good choices for semi-formal events.
For a formal wedding a tuxedo is ideal though in today's day and age a dark suit is also acceptable. Essentially choose whichever garment you already own, and if you own neither rent a tuxedo. For more information, you may also want to read our guide to black tie attire. If the wedding is semi formal then you should either wear a suit or a sport coat. There is no real ideal here, and either is appropriate; so choose whichever garment you are more comfortable in and looks the best. For more information, you may want to read our guide on Semi-Formal Attire.