I think Amalia has influences from Maxima's style. She has been using bright colors and diverse (busy) textures for a while now. Even the style of her clothes have that Maxima feel, the ruffles, the over-the-top styling. I doubt that by now Maxima dresses her daughters (except for Ariane), but I believe that (from the 3 girls) Amalia is the one who looks up to her mom's style the most. She must really like that style.
While Alexia, I feel differently. She dresses with more monochromatic colors. The style is also more soft, with no busy prints. And that shows her personality and that she's the one who picks her clothes. It's charming to see how the sisters have different styles.
