King Willem-Alexander of the Netherlands, in the past got some critique (at least in the Netherlands itself) on his clothing style, but it seems lately that he's improving, see for instance this blog entry:
De pakken van koning Willem-Alexander | ModekoninginMaxima.nl
I personally think that the photo's in this article show some good suits which fit him well...
(and might I add: i also like the cufflinks)
At his recent visit to the caribian islands of Bonaire and Aruba, the King did wear a suit occasionally, but also used the local tradition of wearing a "Wayabera" (loose shirt)
Now I quite like this, I'm all for casual wear when suited for the occasion, but I wish he had chosen a different color than white; it looks a bit pale on him, I think a brighter color, like something in blue or green would have been better...