Evening Dress Codes Explained: Black Tie to Semi-Formal

Evening dress codes at a glance

Evening dress codes follow a simple scale: the more formal the code, the longer and more structured the dress. Under a white tie or black tie dress code, the answer is a floor-length gown. Black tie optional and formal allow a long gown or a refined midi. Cocktail attire asks for a dress that ends around the knee or mid-calf, and semi-formal attire is a step lighter again.

When an invitation leaves you unsure, choose the longer option. Being slightly overdressed at an evening event is rarely a problem.

White tie

White tie is the most formal dress code of all. It appears on invitations to state dinners, certain charity balls, opera galas and a small number of very formal weddings (for those, see what to wear to a wedding as a guest). For women it means a full-length gown and nothing shorter. Long evening gloves are the traditional accompaniment; if you are unsure, ask the host.

Look for a silhouette with real presence: a structured bodice, a full or sweeping skirt, and fabric with weight and a gentle sheen, such as taffeta, satin or brocade. Jewelry tends to be more formal at white tie than anywhere else, so a dress with clean lines leaves room for it.

Black tie dress code

Black tie is the evening dress code most people meet, at evening weddings, galas, award dinners and formal parties. The classic answer is a floor-length evening gown. Some hosts in the US accept a very elegant cocktail-length dress at black tie, but a long dress is the safer choice and never looks out of place.

Black tie leaves more room for silhouette than white tie. A column, an A-line, a draped gown or a one-shoulder line all work. What matters is that the dress looks finished: a defined waist, clean seams and a hem that falls neatly to the floor with your shoes on. Deep colors such as black, navy, burgundy and red are traditional for evening, while pale blue, champagne and soft pastels suit summer events and outdoor venues.

Creative black tie

Creative black tie keeps the length and polish of black tie and adds personality: a bold color, a print, an unexpected neckline or a statement sleeve. A floor-length gown or an elegant midi both work, as long as the dress still looks like evening wear.

Black tie optional

Black tie optional means the hosts will be in black tie, and guests may join them or dress one step down. For women, a floor-length gown is always correct. A refined midi or tea-length dress is equally acceptable, as long as it feels like evening wear rather than something for the office. This is a good moment for a dress with a sculptural detail, such as an asymmetric neckline or a cape shoulder, which reads as deliberate even at a shorter length.

Formal

"Formal" on its own is the least precise of the evening dress codes. For an evening event it usually sits close to black tie optional: a long gown or an elegant midi, in a fabric with some structure or drape. For a daytime event it can be read more lightly. Consider the venue and the hour as well as the words on the card: a formal dinner in a hotel ballroom calls for more than a formal reception in a garden at six o'clock.

Cocktail attire

Cocktail attire is the shortest of the evening dress codes. Dresses usually end somewhere between just above the knee and mid-calf. The emphasis moves from length to cut and detail: a fitted bodice, an off-the-shoulder line, a strong color. Tailored separates, such as a structured top with a midi skirt, also work well.

Avoid anything that reads as daywear. A cocktail dress should look deliberate, even when it is simple. If in doubt, a black midi with a clear shape is the most reliable choice you can make.

Semi-formal attire

Semi-formal attire sits between cocktail and dressy casual. A knee-length or midi dress is right, in lighter colors for daytime and deeper ones for evening; a floor-length gown can look overdressed. It appears on invitations to daytime weddings, dinners and many work celebrations.

Think of semi-formal as cocktail with less emphasis on drama: a clean line, a defined waist and good shoes do most of the work.

Choosing an evening gown by length and silhouette

Once you know the dress code, a few principles help with the dress itself.

• Fit the length to your shoes. Long dresses should just skim the floor in the shoes you plan to wear, so try them on together.
• Balance structure and movement. A structured bodice keeps a long dress composed through a long evening, and a skirt with movement keeps it from looking stiff.
• Read the setting. Terraces and gardens suit lighter fabrics and slightly shorter hems; ballrooms suit weight and sheen.
• Plan for the whole night. You will sit through dinner, stand for photos and perhaps dance, so sit and walk in the dress before the event.
• Let one element lead. A strong color, a dramatic neckline or a sculptural shoulder is enough. Keep the rest quiet.

LARMES evening dresses for each dress code

A few examples, matched to the dress codes above:

• White tie: the Adeline Dress, a floor-length white gown with a classic couture structure and a long pleated train.
• Black tie: the Habiba Dress in Red, a flowing floor-length gown with a sculpted waist, crossed draping at the bust and a full skirt that falls in soft folds.
• Black tie: the Anne Dress, a floor-length white design with an asymmetric shoulder panel secured by hidden seams and an asymmetric pleated skirt, so it has volume without bulk.
• Black tie optional: the Kyra Dress, a white A-line maxi with cape sleeves, made for evening parties.
• Formal or cocktail: the Callum Dress, a deep merlot midi that draws on 1950s fashion, with a precisely structured, asymmetric silhouette.
• Semi-formal: the Merit Dress in Black, an off-the-shoulder midi with a V-neckline that holds its shape as you move.
• Cocktail: the Giorgia Dress, a red A-line mini with a scarf neck, for the shorter end of the dress code.

Adeline, Anne and Kyra are white. If the white-tie or black-tie event is a wedding, leave white to the bride and choose a color instead, such as the Habiba Dress in Red.

Sizing and timing

Standard sizes are S, M and L, and many designs also come in XL. A standard size can be adjusted at the bust, waist and hip, or a piece can be made in a custom size from your measurements: here is how to measure yourself for a dress, and our size guide gives every size in inches and centimeters. The model in our photos is 168 cm (5 ft 6 in) tall and wears a size S.

Every piece is made to order in our Ho Chi Minh City atelier. Order at least six weeks ahead for a standard size and eight weeks for a custom size: making takes about 7 to 10 days (15 to 20 for a custom size), and international delivery usually takes 7 to 20 business days. If you might need to exchange a size, order earlier still.

Orders to the US and Canada may be charged import duties or taxes on delivery, which are not included at checkout; see our shipping policy. We offer exchanges rather than refunds. In Ho Chi Minh City you can book a fitting at our store; please contact us before you visit.

See our full range of evening dresses to find the right gown for your next invitation.