Dr. Jill Biden, the former first lady, continued her custom of donning American designers as she picked a Ralph Lauren wrap coat for Donald Trump's inauguration

Just ten days ago, at Jimmy Carter's state funeral at Washington National Cathedral today, all five living U.S. presidents attended: Bill Clinton, George W. Bush, Barack Obama, Donald Trump, and Joe Biden. Today, all five men were once again in the same place, as Clinton, Bush, Obama, and Biden attended Trump's inauguration.

Inauguration Day festivities brought plenty of high-profile style on everyone from incoming political figures to inauguration performers. "Good Morning America" is taking a closer look at the standout looks of the day from Ivanka Trump's sleek, deep green ensemble to Usha Vance's soft pink coat with a matching scarf.

First lady Jill Biden and President-elect Trump surprised observers in December after appearing chummy at the reopening of the Notre Dame Cathedral in Paris — and now the former first lady has revealed what the pair talked about in that viral moment.

Melania Trump kicked off Inauguration Day with an outfit that has all the hallmarks of her favoured first lady style: sharply cut, with spiked heels and a dramatic flourish via the headgear. It is simultaneously serious and chic.

The inauguration is really about swearing in the next president, but first ladies throughout history have stolen the show with their inaugural gowns.

Jill Biden wrote a note for Melania Trump as she's getting ready to move back into the White House for her second term as First Lady.

The guest list includes some of America’s most influential tech billionaires and politicians as well as some foreign leaders and celebrities who have embraced Trump.

And not just American designers but, in Mr. Biden’s case, Ralph Lauren, a man who built his entire identity on the American dream. For her part, Jill Biden chose labels designed by women, like Markarian and Gabriela Hearst in New York.

A pastor, his eyes closed, preaches his heart out for history. A former president spots an acquaintance, then grins and winks.

Ahead, we break down 21 of the best Inauguration Day looks of all time, from Lady Gaga’s subtly patriotic Schiaparelli dress to Jackie O’s Halston hat and Oleg Cassini coat.