The "holiday" season in the Philippines is not only a calendar event, but also a fashion turning point since by September the weather should be cooler. Hence, more layers can be adapted. It also means more Christmas parties to attend starting as early as November. Hence the license to be more spiffy.
Scarves, beanies, vests, blazers.
Black bow ties that disappear in monochrome.
These are some of the conventions for "holiday", which I find very restricting. Hell, this rule is more for evening wear. Any time of the year.