DDivinity, well, I'm pretty sure when talking about Cinderella's rags, me and those people meant when her pink dress, which wasn't rags, was ripped into rags. Meaning it had great colors and somehow, this stylish ripped look. Anyway, what I was saying was that if this is about the prettiest dress, not just favorites, then I don't think any rags can win.
And the poll has me questioning people's tastes and opinions of pretty!

I'm half-joking, but on another note, I think Aurora's is pretty partly because of her film's style. They intended to make their most strikingly beautiful film, and the linear, symetrical, angular style is a beautiful thing. Myabe if her collar was just less high and far out, you know? So that Aurora wouldn't poke someone's eye out just by turning...
Chernabog, I actually think that dress is great! It's not the prettiest, but it's actually one of the great dresses if it was just, you know, not made from a sail and rope!
Rapunzel, is Rapunzel's dress really German? I heard they use a French renaissance style on the film...maybe I'm wrong... Snow White's is very German though, right? Her film was definately German styled. I think Snow White's dress would be good if the colors were just...fixed a bit. If her yellow was a less bright gold, or white, and if her blues and reds were deep and purplish.
As for Tiana's dress, I totally get what you mean! It's like it's a bunch of lilypads sewn together with magic than really a practical dress a princess would wear like the other princesses have!
Actually I forgot to say...I like Tiana's
real royal wedding dress (the one she wore in the church) the best of her outfits. With the gold trim crossing over her skirt, it's just gorgeous (though I think the skirt should be fully down to the floor, but I'm picky like that!).
Enigmawing, you may have found at least one solution to the problem of Ariel's hair with the dress. The colors look great! I'm pretty sure her dress actually had a kind of trim or fold on the large pink round parts on the skirt, I remember details like that. But I could imagine the folds unfolded...or she just cut them off or something! How did you get that same charcoal/painting look in that background, it could have come straight from the movie!