Kate Middleton has to follow a number of rules as queen consort and as her husband Prince William prepares for kingship.

Here are some of the protocol that the Duchess of Cambridge must uphold all the time.

1. Dress Appropriately

Middleton has been praised for her fashion. However, according to a report, she has a whole set of rules and restrictions when it comes to what she should wear due to her future role. Queen Elizabeth II is reportedly regularly giving her notes on what certain hem, outfit or color of tights to wear.

2. Always curtsy to the most senior royal

Even if Middleton is married to the future king, she has to curtsy to the most senior royals, including Queen Elizabeth II. On Sunday, the Duke and Duchess of Cambridge joined the Queen, Prince Harry, Mike and Zara Tindall and more royals for Easter and to celebrate Queen Elizabeth II’s birthday.

In a clip shared on Instagram, Middleton was captured on camera giving a perfect curtsy to the monarch. Meanwhile, Prince William was the only one who didn’t bow to Her Majesty.

3. Sit properly

The royals are being watched every time they are out and about. Many watch the way they move, talk and sit. Middleton is popular with her “duchess slant.” The position involves keeping the knees and ankles tucked closely together while the legs are slanted to the side.

According to Myka Meier, royal etiquette expert and founder and director of Beaumont Etiquette, the “duchess slant” is the perfect pose when a camera is shooting directly in front because by slightly slanting the knees, the legs are angled to protect one’s modesty.

4. Always wear a hat

Royals are expected to wear a headpiece every time they left the palace for a formal event such as Ascot, weddings and church ceremonies.

However, hats are never worn indoors after 6 p.m. because that is when the ladies change into evening dresses and wear tiaras. When it comes to wearing tiaras, only married women are allowed as it’s deemed to be a sign that one is already taken.

5. Avoid PDAs

Holding hands are deemed unprofessional that’s why the Duke and Duchess of Cambridge rarely do this in public. However, Prince William and Middleton have rare PDA moments, too.