As the capital of the United States, Washington, D.C., is always bustling with activity and has an appropriately formal air about it. This clearly translates to the business dress code for both men and women. While there are no official rules, here are a few things to keep in mind.

• Suits are commonplace for both men and women. While in the mid-summer heat, jackets may be carried while commuting, most professionals don’t forgo them entirely even when humidity soars.

• Depending on your audience, consider sprucing up your standard suit or blouse and blazer combination with a fun accessory like a patterned tie or a statement necklace.

• Heels are commonplace for women but not required. Particularly if you’re commuting to and from meetings on the Metro, consider wearing a pair of stylish, sensible flats or low heels.

There is so much to see and do in the city, from the 13 free museums on the National Mall to a tour of the White House to a stroll through picturesque Georgetown. Be prepared for a bit of everything by packing these essentials.

• A smart pair of shoes is key. While Uber and taxis are available, most people commute by walking or taking the Metro. Plus, you’ll likely be on your feet for hours while touring through the many museums.

• Bring several layers no matter what the season. In summer, temperatures can soar into the 90s with high humidity, but a light layer will be welcome in air conditioning. In winter, snow is common, so a hat and an extra sweater and scarf will be appreciated additions to your suitcase.

• Bring one polished outfit for a night out at a restaurant or the theater. Most locals will wear their business attire or dressier clothes, so more casual garb will stand out.

Casual dress is a wise choice for touring the capital, but once it’s time to enjoy the  nightlife, it’s best to sport a more polished ensemble. Here’s what to bring.

• If traveling on business, it’s completely acceptable to wear your business attire to a more formal dinner or performance. Most locals will be coming straight from the office and similarly dressed.

• Most locals have a decidedly preppy aesthetic — think high-quality materials done in classic, tailored silhouettes. For men, a suit or well-cut blazer with slacks is practically the uniform. For women, slightly more conservative dress is common even for a night out.

• For a more casual outing — to a bar, perhaps — consider packing a dressier pair of jeans to pair with a nice blouse or a sharp blazer and shirt.