We're living in the golden age of royal weddings. Not only have we been fortunate enough to experience Prince William and Kate, ahem, Katherine Middleton's wedding, as well as Prince Harry and Meghan Markle's, we'll get to see Princess Eugenie marry her fiancé, Jack Brooksbank, on October 12. While pomp and circumstance come standard at any wedding, it looks like Eugenie's will be a little more formal. According to Vanity Fair, which got a peek at the wedding's formal invitation, the dress code is strict. Very strict.

Vanity Fair reports that the celebration will include a "carriage procession, a lavish wedding reception, and a two-day wedding party set to rival all others." But in addition to those details, the magazine noted the dress code. Women will be required to wear day dresses and hats. And while Markle and Prince Harry allowed their guests to wear "lounge suits," aka the suits you see on finance bros grabbing lunch at Au Bon Pain, Eugenie won't be allowing her guests the same option. For her wedding, the guys planning to attend will be required to wear morning coats. No normal suits allowed.

Princess Eugenie and Jack Brooksbank
Credit: WPA Pool/Getty Images

Princess Eugenie and Jack Brooksbank

WPA Pool/Getty Images

Unfamiliar? You've probably seen one before. It's pretty traditional in Britain and wedding guests such as David Beckham have worn them to the other royal weddings. Morning coat are longer than the jacket in a business suit (or "lounge suit," according to Markle's invitation, though it's pretty tough to lounge in a full suit), but not as formal as tails. The outfit sits somewhere between something a guy would wear to work and full-on black tie. Cosmopolitan notes that morning suits "should fit snug" and "have an S-shape silhouette that goes over the seat."

According to Town & Country, Eugenie will send out more information as the wedding date gets closer, just in case her invitees — and there are about 850 of them — have questions about what to wear.

Prince William and Prince Harry Wedding Pippa Middleton And James Matthews
Credit: Max Mumby/Indigo/Getty Images

"There will be additional guidance for the attendees," etiquette expert Myka Meier said. It's not necessarily unusual, becuase Meghan and Harry did the same. "Though we will not see it, there will often be an internal document circulated to give them more information about the dress code."