Kate Middleton has always been regal, but perhaps never more regal than when she is literally wearing the color "royal blue." Yes, it's a bit on the nose, but still.

The Duchess of Cambridge (open in new tab) wore an eponine blue gown that showed she meant business on the second day of the COP26 climate change conference in Glasgow. The ankle-length dress featured square shoulders, a wrap front, and a belt with two black buttons.WhatKateWore (opens in new tab) retweeted one Twitter user (opens in new tab) who I pointed out that it had been featured." Makes sense for sustainability. She's probably had this piece for a while," they hypothesized.

The duchess paired her dress with navy blue pointed-toe suede pumps, her hair pulled back neatly and low, revealing drop earrings. As a symbol of remembrance, she wore a small metal poppy pin.

Prince William wore a navy blue suit that matched his wife's shoes and, like British Prime Minister Boris Johnson, wore a poppy pin. Here the three are on the steps:

The Duke and Duchess are pictured laughing casually with Prince Charles (opens in new tab) and Camilla Parker-Bowles (opens in new tab), aka the "New Fab Four" (opens in new tab) on Instagram ( opens in new tab).

The Queen was advised not to visit Glasgow for health reasons (opens in new tab), but as part of the event she made an effort to share a message close to her heart. Many hope that "the legacy of this summit, which will be written in the history books yet to be printed, will portray you as leaders who did not miss opportunities and who answered the call of future generations," she said, adding that world leaders "need a clear plan to deal with the climate crisis. She added that world leaders need a clear plan to address the climate crisis.

"Welcome the world to @cop26uk," Kensington Palace captioned the post. 'This evening, the Duke and Duchess joined the Prince of Wales and the Duchess of Cornwall at the #COP26 reception, where Her Majesty the Queen greeted the assembled delegates with a recorded message.'

Royal fans were typically enthusiastic about both the Cambridges' participation in the event and the Duchess' always spot-on fashion sense. 'As always, the Duchess is so beautiful!' One wrote.

The royal couple also got to meet the finalists for the Earthshot Awards (opens in new tab) as part of the event." Great to finally meet the @EarthshotPrize finalists in person at @COP26UK," they wrote on Instagram (opens in new tab). 'This week at COP we'll be showcasing their amazing innovations to help repair our planet. The #EarthshotPrize finalists will also meet some of the world's largest corporations, philanthropists, and nonprofits that are members of the Prize's Global Alliance. They will provide unparalleled support to the Prize finalists and help them scale their solutions. #COP26" [17].