On the most formal end of the cocktail scale, youd be expected to show up in a dark suit (think: navy, black, or charcoal) with a white shirt and a dark, solid-colored tie, along with a pair of polished black Oxfords or brogues
Can I be honest
Typically, topdressing is done at an average depth of or 1 ton per 1,000 square feet

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Dressing well makes you feel good, whether it is for a formal affair or a semi-formal gathering
There aren't any hard and fast rules, but often you'll want to stick with longer or mid-length gowns for more formal events