Good Pictures at this link. Pictures in below link also.
Awkward Apec fashion: what world leaders wore – in pictures
Quote from bottom link: "World leaders have Bill Clinton to thank for starting the annual tradition back in 1993, when he hosted the summit in Seattle and gifted world leaders in attendance with matching bomber jackets."
"The next year, the tables turned on Clinton and it was his turn to don a traditional Indonesian shirt selected by the summit's subsequent host country."
"President Barack Obama made no secret of the fact that he wasn't such a fan of the tradition with his decision to nix it when it was his turn to host the APEC summit on his home turf of Hawaii in 2011, after previously threatening in jest that he would make world leaders wear aloha shirts or grass skirts."
President Trump was styling and profiling in matching blue shirt at APEC
Perhaps the simpler shirts that the heads of state wore this year were a sign of respect. No one needs to have worn some of them from past years.
Trump in blue silk shirt rocks it! The others in Indo wear look like a buncha dufuses.