The AAA were never the best dressed royal kids, which I find weird, since Maxima dresses really nice, full of vibrant patterns and colors. Lovely hats as well. But, I think nowadays, the girls dress what they like, I think their style improved a bit over the years, except for Ariane, which still dresses on the dull side.
But, I agree on the heavy dresses that Amalia wears. I remember the horrid dress she wore at last year's summer photocall, and everyone here disliked it too. She's a teen, but she's tall and robust, maybe she has problems to find age-appropriate clothes. Or maybe she's just experimenting on fashion. Besides, she has a very beautiful hair IMO.
Alexia looked okay I think. The red dress is very pretty, I think what went wrong with the overall look was the collar, and...maybe the sleeves? But the collar was old-looking. But, I liked the combination of red and black.