Dressing for a semi formal event isn't as stressful as dressing for a formal event. But it's important to remember that semi formal is still formal. Jeans, shorts, sneakers and T-shirts are unacceptable. Whether the semi formal event you're attending is a wedding, an anniversary party, or a business event, it's important to dress accordingly.
Check the invitation for the time and season of the event, which will help determine what you should wear.
If the event is during the day, men can wear dinner jackets and tailored slacks or trousers, or they can opt for a suit. According to Carley Roney, editor of "The Knot," both light and dark suits are acceptable, but reserve khaki or white linen for summer. Wear a crisp dress shirt. Ties are not required, but if you do wear one, use a four-in-hand tie (the kind worn with business suits). Finally, slip on a pair of polished shoes.
For day events women may wear cocktail dresses or summer dresses, as long as they are not too casual. No denim. Hem lengths can vary. Cocktail dresses should be no more than an inch above the knee. Another option for women is a pantsuit or business suit (but not a wool business suit, which isn't dressy enough). Pair with matching heels or embellished flats.
According to Roney, darker, more formal hues are appropriate for evening events. Men should wear dark suits (navy, black or dark gray), dress shirts, dark socks, polished shoes and usually four-in-hand ties. Vests may be worn, but they're not required.
For evening events, women wear cocktail dresses, business suits or pantsuits. Taffeta, chiffon, velvet, satin and silk are appropriate. Wear matching heels or flats. Accessorize with a clutch bag and a shawl if it's chilly outside. Be sure not to wear white if you're going to a wedding.