I respect all your points of view although I don't agree at all.
It is not necessary they wear ceremonies dresses to attend a wedding, of course not, but nowadays there a lot of choices in order to wear little girls in a appropiated way, some dresses similar to Netherland's princesses dresses wearing on King's Day would be perfect (the three girls participated in all kind of games and activities on the streets, and they were not uncomfortable at all).
I remember that Leonor and Sofía wore much better time ago than nowadays. Of course, it is not their fault.
@HereditaryPrincess: I am sure you go to events or ceremonies where kids are wearing in a very comfortable and casual way, but that means nothing. I also have the same experience, even I saw kids and adult people wearing jeans to attend a Christening ceremonie.....wich is really disgusting and very impolite. When people go to a special event, never minds if it is a wedding, a Christening, a dinner party, a military event, etc, etc, they must wear in the best and appropiated way, not only because it is polite to do it, but because that shows the respect you feel for people who organise the event and invite you. Of course, kids are not responsable for wearing in a casual or not appropiated way, the responsability belongs to parents....and the obligation of parents is teaching them in the right way. If you don't bring kids up since the beginning, you will find troubles when they become teenagers.