(Zara, by the way, will be happy to assist you should you want to fly the Union Jack for yourself:
Apart from sporting events, we've seen some of these national displays from a handful of other royals over the years.
You can see the rest of them here. They're something to behold, I'll say that.)
The Dutch have adopted orange as their national color, and their royals are not shy about wearing it in abundance. The actual flag, though, is not so common for patriotic wear, which is why Máxima's jacket stands out.
Máxima also starts us into the trend of flag jewelry, as she owns a brooch in the shape of the Netherlands flag (see it on display at the World Cup here). The current generation of Danish princes seem to have a fetish for this as well, but instead of brooches, they go for engagement rings.
You can see Alexandra's ring, and many more, right here.)
What do you make of this patriotic trend? Delightful, kitschy, or delightfully kitschy?
Photos: Getty Images