From Black Tie to Casual: Understanding The Wedding Guest Dress Code
The Invitation Says: "White Tie"
This the most formal of all dress codes (think: White House state dinners).
For the ladies: A formal floor-length evening gown.
For the men: A tuxedo, a long black jacket with tails, a formal white shirt, white vest and bow tie, white or gray gloves, and black formal shoes.
The Invitation Says: "Black Tie"
This is the next most formal wedding dress code, and usually means the wedding is an evening event.
For the ladies: You can go a bit dressier and wear a formal floor-length gown, or choose a short, dressy cocktail dress. (If you're unsure about the appropriate dress length, the bride, wedding party, or friends should be able to answer your questions.)
For the men: A tuxedo. A black bow tie, black vest or cummerbund, and patent leather shoes are also suggested. For summer weddings, a white dinner jacket and black tuxedo trousers are also acceptable. (You might be able to get away with a conservative black suit as a substitute for the tux.) formal evening dress
The Invitation Says: "Formal" or "Black Tie Optional"
The wording here indicates something slightly less formal than black tie is acceptable. So, a tuxedo isn't required, but the event is still formal enough for one to be appropriate.
For the ladies: A long dress, dressy separates, or a formal cocktail dress.
For the men: A tuxedo or a formal dark suit, white shirt, and conservative tie.
The Invitation Says: "Semiformal" or "Dressy Casual"
Take your cues from the time of the event: Wear darker, more formal colors for an evening wedding; opt for light colors and fabrics for a daytime event.
For the ladies: A cocktail dress or a long, dressy skirt and top.
For the men: A suit and tie, dark or light depending on the season and time of day.
The Invitation Says: "Festive Attire"
Relatively new, this one can leave many guests scratching their heads. Basically, guests are given the go-ahead to have fun and play with their look. Opt for cocktail-party attire featuring bolder colors and playful accessories.
For the ladies: A cocktail dress or party dress in a fun color, paired with playful accessories.
For the men: A suit and tie, jazzed up with a bright tie.
The Invitation Says: "Casual"
This indicates the wedding will likely be held outdoors or on the beach, meaning the event will be much more laid-back, especially when it comes to attire. That said, jeans, shorts, and tank tops are probably not appropriate unless they're specifically noted as acceptable.
For the ladies: A summer sundress is appropriate (just make sure the fabric isn't overly formal).
For the men: Dress pants or khaki pants with a button-down shirt, tie (though you might be able to get out of wearing a tie), and sport jacket or sweater.