What to Wear to the Opera, the Theater or a Gallery Opening in Your 30s and 40s

For the opera, the theater or a gallery opening, wear a knee length or midi dress in a dark color, or black wide leg pants with a blazer, and bring a coat you can carry. The evening usually starts at your desk. The Lucy Jacquard Midi Dress in Midnight Blue ($695) works for a 9 a.m. meeting and for the evening performance. Luna publishes its length, 46 inches from the back of the neck to the hem on a size 2, so you can measure where the hem will fall in a theater seat before you order.

Do I need to dress up for the symphony or the theater now?

For a regular performance, most theaters and concert halls do not enforce a dress code. A polished, comfortable outfit is enough: a knee length or midi dress, or tailored pants with a blouse or a blazer.

Opening night, a gala performance or a benefit is a different evening. The invitation usually names the code, often cocktail or black tie optional. A midi in an evening fabric, a lace or metallic dress, or an evening jumpsuit fits that room. Save a gown for an invitation that says black tie.

A gallery opening sits in the middle. You often stand for 2 hours on a stone or concrete floor with a glass in your hand, so shoes matter more than at a seated performance. Wear 1 dark shade with 1 detail and let the art lead.

What to wear to the opera, the theater or a gallery in your 30s and 40s

In these years, several invitations often land at once. A subscription series, a client with spare tickets, a friend’s opening and a benefit can all land in the same month. Most of them fall on a weeknight after a full day at work. Buy fewer pieces and give each one at least 3 of those evenings. Then decide how long the hem should be when you sit, and how the outfit will go from the office to the evening.

The midi for a subscription night

The Lucy is a midnight blue jacquard in 80% cotton and 20% structured technical crepe. It has a sweetheart V neckline, sheer 3/4 sleeves and a sheer band set in near the hem. The skirt falls to mid calf and covers your knees when you sit. Its page names an executive luncheon, a daytime wedding and an evening reception among its occasions. Wear it to the opera, a client lunch and a wedding, and the $695 comes to about $232 per wear. It is machine washable on a gentle cycle.

The knee length dress for the theater

If you prefer the knee, choose the Jody Lace Cocktail Dress in Midnight Green ($550). It is fitted, with a lace bodice, a sheer illusion yoke, short lace sleeves and soft draping at the waist. It measures 39 inches on a size 2. The page notes that the hem sits at the knee on most heights. The short sleeves cover the upper arm in a cool hall. The deep green stands out in a theater row full of black.

The dress for opening night

For a premiere, the Iris Off-Shoulder Cocktail Dress in Anthracite ($550) brings more shine. Its anthracite metallic finish reads close to black in daylight and warms to a shimmer under lamp light. A pleated off-shoulder neckline sits across the collarbone. Small dark crystals are set into sheer bands at the waist. It is knee length, 41 inches on a size 2.

Straight from the office

The Barbara Tailored Blazer in Black ($610) is black structured twill with notched lapels, 4 buttons and fine red piping on the flap pockets. Wear it all day over the Agatha High Waisted Wide Leg Pants in Black ($595). The pants have a high waist, a pressed front crease and side pockets, and they fall straight to the floor. At a gallery, plain black keeps attention on the art.

The Aria Jumpsuit in Black ($595) does the same job in 1 piece. It has cap sleeves, a mesh yoke across the top of the bodice, a belt with a rectangular buckle and wide legs. The Aria page suggests the Barbara over it: the blazer covers the mesh through the working day and comes off at the venue.

Our guide to choosing a first cocktail dress in your 30s covers the dress you will wear for years. Our guide to holiday party outfits for women in their 30s and 40s puts the Barbara over a lace dress.

How do I dress for a cold theater?

Many halls keep the air cool. The coat check line after the final bow can be long. Between October and March, wear the Paula Textured Coat with Faux Fur Collar and Cuffs in Black ($770). It is textured black with a faux fur shawl collar, faux fur cuffs and a Bemberg lining. It measures 42 inches on a size 2. It covers the green Jody by 3 inches and the Iris by 1 inch. Over the Lucy, 4 inches of jacquard show below the coat. The Paula is dry clean only.

In spring and summer, bring the Barbara blazer and put it over your shoulders in your seat. For the weeks in between, read our guide to light coats for a November wedding, a gala and the theater.

What to avoid

A hem above the knee rides up in a theater seat. A large tote has nowhere to go in a row. Sequins and loud prints compete with the art at a gallery. A brand new heel is a risk on a floor where you stand for 2 hours, and an evening gown looks out of place at a matinee.

Shoes and bag

At the opera and the theater, wear a pump or a slingback you can climb balcony stairs in. At a gallery, a pointed flat or a low block heel is easier on stone. Carry a small structured bag that fits on your lap, with room for a phone, a card, a key and a lipstick.

For each venue in more detail, read what to wear to the opera or the symphony and what to wear to an art gallery opening. Every piece above is in opera, theater and gallery outfits, and other events are on the Shop by Occasion page.

A short checklist

• Read the invitation for opening night or a benefit, where the dress code is usually printed.
• Choose a hem at the knee or below and check its listed length against your own.
• Pick sleeves or a layer you can put on in your seat.
• Wear shoes you can stand in for 2 hours.

Questions about the opera, the theater and gallery openings

Can I wear pants to the opera?

You can. Wide leg pants with a blazer or a satin blouse, or an evening jumpsuit, are accepted at the opera, the symphony and the theater. The Barbara blazer over the black Agatha pants gives you 1 line of black from the shoulder to the floor.

What is the difference between opening night and a regular performance for what to wear?

For a regular performance, a polished knee length or midi dress or tailored pants is enough. For opening night, the invitation usually prints a dress code, often cocktail or black tie optional, so choose lace, jacquard or a metallic finish.

What color is safe to wear to an art auction or museum gala?

Black, navy, midnight green and deep wine are safe at both. At a gallery, wear 1 dark color with 1 detail.

Can I go to the theater straight from work?

You can. Wear a blazer over wide leg pants or a jumpsuit through the day and take the blazer off at the venue. The Barbara blazer covers the mesh yoke of the Aria Jumpsuit in Black until the evening.

Where can I buy an outfit for an opera night in the United States?

Luna Fashion House sells its opera, theater and gallery pieces at lunafashionhouse.com in US dollars. Every piece is made in the Luna atelier in Serbia and ships from California.

Does Luna ship free, and can I return a piece?

Shipping to any US address is free. Orders ship from California and arrive in 2 to 5 days, and you can return any order within 30 days with no questions asked.