Popsugar Fashion Celebrity Fashion Princess Eugenie Wedding Dress Code Princess Eugenie's Wedding Had a Strict Dress Code — as Always, Hats Were a Must 12 October 2018 by Kelsey Garcia Image Source: Getty / Gareth Fuller / WPA Pool Casual is not a word you would use to describe Princess Eugenie and Jack Brooksbank's nuptials — or any other royal wedding for that matter. At the elegant event on Oct. 12 at Windsor Castle, guests were expected to look the part in morning dress. What does that entail exactly? Per the official invitation, male attendees were expected to wear their morning coats, and female attendees were asked to wear day dresses with hats. A morning coat is a formal jacket with tails, which is then paired with a waistcoat, trousers, and typically a top hat. The day dress needs to be both formal and daytime-appropriate — and in case you hadn't noticed, the hat is an essential element. Though the wind proved to be a bit of an issue, it didn't stop guests from looking fancy in their formal wear. Ahead, see examples of how guests stuck to the dress code. Related: All of the Outfits From Princess Eugenie's Wedding We'll Be Talking About For Years to Come Poppy Delevingne Image Source: Getty / Matt Crossick / WPA Pool 1 / 13 Pippa Middleton and James Matthews Image Source: Getty / Adrian Dennis / WPA Pool 2 / 13 Princess Beatrice Image Source: Getty / Andrew Matthews / WPA Pool 3 / 13 Meghan Markle Image Source: Getty / Gareth Fuller / WPA Pool 4 / 13 Prince Harry Image Source: Getty / Alastair Grant / WPA Pool 5 / 13 Ellie Goulding Image Source: Getty / Gareth Fuller / WPA Pool 6 / 13 Pixie Geldof and George Barnett Image Source: Getty / Matt Crossick / WPA Pool 7 / 13 Demi Moore Image Source: Getty / Matt Crossick / WPA Pool 8 / 13 Liv Tyler Image Source: Getty / Matt Crossick / WPA Pool 9 / 13 Queen Elizabeth II Image Source: Getty / Alastair Grant / WPA Pool 10 / 13 Princess Anne Image Source: Getty / Gareth Fuller / WPA Pool 11 / 13 Lord Frederick Windsor and Sophie Winkleman Image Source: Getty / Gareth Fuller / AFP 12 / 13 Naomi Campbell Image Source: Getty / Gareth Fuller / WPA Pool 13 / 13 Celebrity FashionThe RoyalsWeddingsWedding Guest DressesWedding GuestsThe British RoyalsJack BrooksbankPrincess EugenieAccessoriesCelebrity Weddings