Looking at photos of international political meetings nowadays can be pretty boring. Everyone, be they African, North-American, Asian, Latin-American or European wears the same standardized black(or, if they're feeling creative, blue) suit, with a matching tie. The only oddballs are Arab sheiks, communist dictators with their proletarian-military greens, and the occasional African leader wearing bright colours.
With a POD no earlier than 1900, try to make the G-8 or G-20 meetings more... colorful. Maybe more varied, with each country/region adopting a dressing style from its own culturer.