This is the time of year when people are most likely to receive written invitations to celebrations of everything from gallery openings to New Year’s Eve parties. It’s great to be so popular, of course, but it can be confusing to figure out how to dress appropriately. (It’s embarrassing to show up at a clambake in your tuxedo.) Here, in order of formality, is what those footnotes at the bottom of your invitation really mean.

Casual: Both men and women may wear slacks, jeans, or shorts with sweaters, t-shirts or other weekend-appropriate tops. Women may wear skirts or informal dresses.

Business casual: Slacks and pressed, button-up solid-color long-sleeved shirts, and dark socks with leather shoes are good for both men and women. Men may wear ties if they choose. Women may wear skirts (not too short). Aim for the conservative in makeup and jewelry.

Cocktail attire: For men, either slacks with a sports jacket or a suit work well. A tie isn’t necessary if the shirt doesn’t require one, but with a button-front shirt a tie should be worn. Women wear short dresses (from mid-thigh to slightly above the knee), long pant suits, or dress (not business) suits. Makeup and jewelry can be slightly dressier.

Semi-Formal: Women’s dresses are longer, from knee-length to slightly above the ankle. Men wear a suit and tie, and a vest, if they like.

Black Tie: Men wear black suits, vests or cummerbunds, bow ties (obviously) and shoes with any color shirts (regular or wing collar). Women wear evening gowns. Makeup and jewelry can be more striking.

White Tie: Men wear a black tuxedo suit and black patent shoes with a white, stiff-fronted, wing-collar shirt, white bow tie, and a white low-cut vest. Women wear ball gowns, dancing shoes, dramatic earrings and necklaces (no wristwatch), and opera-length gloves.

Have a great time!