Semi-formal. Ex: dress shoes (such as loafers or Oxfords), dark socks, dress pants, and a button-down dress shirt. A dark suit is always a good option. If you choose to wear a suit, a tie or bowtie is optional. Women following this directive might opt for a cocktail dress or a polished set. Semi-formal also translates to shorter hemlines, bold prints, or elevated separates like a festive top paired with tailored dress pants.