It's a tradition for host countries to choose matching garments for world leaders to wear at the annual Asia-Pacific Economic Cooperation summit

This year the Vietnamese picked a blue silk shirt, and Donald Trump ditched his signature suit and tie in favor of the traditional garment

Past years have seen presidents and prime ministers endure Chilean ponchos, Indonesian batik shirts and Chinese jackets that looked like Star Trek uniforms

Trump and Vladimir Putin shook hands Friday as photographers shot pictures of more than 20 heads of state

On Saturday the two presidents shook hands a second time after Trump arrived at the APEC leaders' meeting

Trump made a beeline for Putin when he entered the room, and Putin stood to greet him; Trump did most of the talking but paused to listen to Vlad at one point

Trump and Putin also spoke briefly as they arrived for the formal 'family photo' of all the leaders

Donald Trump and Vladimir Putin shook hands Saturday in Da Nang, Vietnam for the second time in two days during the Asia-Pacific Economic Cooperation leaders' summit.

Trump entered the summit meeting room and walked straight to his Russian counterpart, who was already seated at the room's giant round table.

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Putin stood and the two shook hands and spoke briefly, with Trump smiling and doing most of the talking.

Later, the two heads of state chatted before posing for a 'family photo' with all the other presidents and prime ministers.

The two presidents stood next to each other Friday night for a less formal group photo, shaking hands before waving at onlookers as shutters snapped.

Like every other world leader in attendance, Trump and Putin continued one of the annual summit's odder traditions Friday night, ditching neckties and dark suits in favor of matching blue silk shirts.

Trump is rarely photographed in anything other than a suit or a golf shirt. On Saturday he was back to his usual sartorial formality, wearing a dark suit with a solid red tie.

All smiles: President Trump grinned broadly as he and Vladimir Putin shook hands for the second day in a row at the APEC leaders summit in Da Nang, Vietnam

Trump walked straight to Putin as he entered the summit room, and Vlad rose to greet him

The APEC Economic Leaders' Meeting is a confab of 21 world leaders

Trump and Putin were assigned places next to each other as the 21 leaders posed for an official 'family photo'

Trump did most of the talking as he and Putin had their moment together on Saturday, but the U.S. president paused to listen at one point

Trump and Putin are pictured talking during the 'family photo' session at the APEC summit

Trump and Putin shook hands Friday at the APEC gala dinner too, while both were wearing the now-traditional strange shirts that mark the annual meeting

It was their first in-person meeting since July in Hamburg, Germany at the G20 summit

Two-armed shake: Trump put his left hand on Putin's back as they two president shook hands

In conversation: Trump appeared to be doing the speaking as the handshake with Putin went on. Putin can speak English and is also entirely fluent in German

Wave for the cameras: Trump and Putin took part in a 'family photo' of Asia Pacific leaders with Trump looking cheerier than his Russian counterpart

Get ready for the camera: Trump and Putin and the other attendees at the summit get ready for the full family photo

WHO'S WHO IN THE 'FAMILY' PHOTO Front row from left: President Moon Jae-in, South Korea and his wife Kim Jung-sook. President Joko Widodo, Indonesia and his wife Iriana. President Michelle Bachelet, Chile. Preside Xi Jinping, China. Sultan Hassanal Bolkiah, Bruenei. President Trần Đại Quang, Vietnam, and his wife Nguyễn Thị Hiền. President Donald Trump, United States of America. President Vladimir Putin, Russian Federation. President Pedro Pablo Kuczynski, Peru and his wife Nancy Lange. President Enrique Peña Nieto, Mexico. Foreign Minidyter Alan Peter Cayetano, Philippines and his wife Lani. Rear row from left: Chief Executive Carrie Lam, Hong Kong. Prime Minister Malcolm Turnbull, Australia. Prime Minister Justin Trudeau, Canada. Prime Minister Shinzo Abe, Japan. Rosma Mansor, wife of Prime Minster Najib Razak, Malaysia. Prime Minister Jacinda Ardern, New Zealand. Prime Minister Peter O'Neill, Papa New Guinea and his wife Lynda May Babao. Prime Minister Lee Hsien Loong, Singapore and his wife Ho Ching. Prime Minister Prayut Chan-O-Cha, Thailand and his wife Naraporn. Special Representative James Soong, Taiwan.

Happy time: The leaders waved for the cameras after the more formal pose

I'm in Vietnam: Trump was greeted by Trần Đại Quang and his wife Nguyễn Thị Hiền, the Vietnamese president and first lady

High-five: Vladimir Putin exchanged a hand-to-hand greeting with Peruvian President Pedro Pablo Kuczynski

Hello neighbor: Trump was photographed next to Enrique Peña Nieto, the president of Mexico, with whom he has had a prickly relationship

All the presidents and prime ministers at the Da Nang event played along with the blue silk shirts on Friday, although Putin upstaged Trump by wearing a dress shirt and tie that was visible underneath his traditional 'ao dai.'

Trump, like everyone else, went open-neck casual.

Vietnam President Trần Đại Quang's team chose the garments, a privilege of host countries that dates back to Bill Clinton at the 1993 APEC summit in Seattle.

That year Clinton gave heads of state matching leather bomber jackets, and some actually wore them.

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A year later Indonesia picked up the idea, asking participants to wear traditional patterned batik shirts that some in the U.S. compared to 1960s upholstery.

It could have been worse for Trump: George W. Bush chuckled along with the crowd as he posed in a red woven Chilean poncho in 2008 at the APEC arrival ceremony.

And in Australia the year before, outback raincoats were the order of the day.

Informal talks: Trump speaks to Canada's Prime Minister Justin Trudeau (right), Mexico's President Enrique Peña Nieto (second left), New Zealand's prime minister Jacinda Ardern (left) and Chile's President Michelle Bachelet (back to camera) on the sidelines

Toast: Vietnam's President Trần Đại Quang raised his glass to Trump at the summit leaders gala dinner in Danang. Also on the table were Thailand's Prime Minister Prayut Chan-O-Cha (beside Trump), his wife Naraporn (to his left), Taiwan's representative James Soong (fourth from right) and Singapore's Prime Minister Lee Hsien Loong (fifth from right).

Somber: Vladimir Putin appeared chillier than other leaders after the family photo was taken

Pacific rim neighbors: Trần Đại Quang, Vietnam's president, welcomed Malcolm Turnbull, Australia's prime minister to the gala dinner

Change of tone: Aung San Suu Kyi was greeted by Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

Warm greeting: Vladimir Putin shakes hands with Trần Đại Quang, Vietnam's president

More somber tone: Putin did not smile as he posed with Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

Meet the strongman: Philippines president Rodrigo Duterte poses with Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

No Mexican wave: Enrique Peña Nieto Mexico's president, kept his hands at his side as he met Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

Pacific concerns: Shinzo Abe, the Japanese prime minister, stood in front of the entrance sign with Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

Royal presence: Brunei's Sultan Hassanal Bolkiah meets Trần Đại Quang, Vietnam's president, and first lady Nguyễn Thị Hiền

Archipelago's leader: Indonesia's President Joko Widodo and his wife Iriana meet Vietnam's president and first lady

Could have been worse: In 2004 George W. Bush played along as Chile's leaders asked everyone to wear traditional woven ponchos

Bill Clinton gave presidents and prime ministers bomber jackets like his (pictured) in 1993

Indonesia's revenge: Clinton's jackets gave President Suharto (3rd from left) the idea of asking everyone to wear batik shirts, and the tradition was born

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Putin and Barack Obama were the only leaders since Clinton's launch to take a break from the tradition.

Obama told world leaders in Hawaii six years ago that they didn't have to play along.

Days after joking that he might pass out 'flowered shirts and grass skirts,' Obama explained that he 'I got rid of the Hawaiian shirts because I looked at pictures of some of the previous APEC meetings and some of the garb that had appeared previously, and I thought this may be a tradition that we might want to break,'

'I suggested to leaders – we gave them a shirt, and if they wanted to wear the shirt, I promise you it would have been fine. But I didn't hear a lot of complaints about us breaking precedent on that one.'

In 2014 he endured a wine-colored jacket in China that drew comparisons to Captain Jean-Luc Picard's uniform in 'Star Trek: The New Generation.'

The matching-clothes tradition at APEC summits hasn't always worked out for U.S. presidents; in 2014 Barack Obama participated, earning comparisons with Captain Picard from 'Star Trek'

Last year in Peru the APEC leaders wore matching wool shawls, a more subtle choice than in most other years

The White House said as President Trump arrived in Vietnam on Friday that a highly anticipated formal meeting between him and his Russian counterpart would not be on either leader's schedule.

'Regarding a Putin meeting, there was never a meeting confirmed, and there will not be one that takes place due to scheduling conflicts on both sides,' Trump's press secretary Sarah Sanders told reporters aboard Air Force One.

'There is no formal meeting or anything scheduled for them.'

'Now, they’re going to be in the same place,' she allowed. 'Are they going to bump into each other and say hello? Certainly possible and likely.'

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'But in terms of a scheduled, formal meeting, there’s not one on the calendar and we don’t anticipate that there will be one,' Sanders said.