"Alternate" meaning "the outfits that they aren't marketed in". I often find that I like the princesses' lesser-known outfits than the one's they re marketed everywhere in, and I thought I'd ask everyone else's opinions on them! :D
If I have missed your favourite outfit, feel free to comment it! (or just comment for the sake of commenting :D )
I didn't include wedding dresses or sleepwear because I'm considering doing other polls on them in the future.
Pocahontas isn't included in the poll because she only ever wears one outfit in the film - the one she's marketed in - and Moana isn't included because I am yet to see her film, so I don't know how many outfits she wears.
For myself, I picked Tiana's blue dress because it's my favourite dress out of all the princess dresses, including the one's they wear in marketing. I like it more than Tiana's green lilypad dress. I love it so much; I want to own it. :D
My other picks, though, could have been Cinderella's pink dress (I've always loved that dress. I was so devastated when I first watched the film as a kid and it got torn apart) and Jasmine's red outfit (I just think red suits her.)
I'm excited to know your opinions!

I like this one and her white evening gown the most. :D

My favorites is this one, Ariel's blue peasant dress, Tiana's blue gown and white evening gown, and Anna's coronation dress.

Hard to pick just one! XD also Tia's white dream dress & yellow dress,, Belle's blue dress & (Elsa's coronation outfit).

Also Tiana, Mulan, Belle's dresses and Merida's blue tournament dress, Elsa's coronation dress and Anna's final dress.

too tough to choose one. I absolutely love this outfit and also Ariel's blue dress, they are my all time fav dresses <3 I also love Belle's pink outfit, Elsa's coronation outfit, Anna's olive green dress, Tia' white dream dress and Ariel's sparkle dress.

I'm sad that Ariel's pink ballgown didn't make this poll. But I love her blue tour of the kingdom gown. I also like some of Mulan's clothes, some of Cinderella's, and some of Merida's.

My favorite DP dress by far <3 I just love its sophisticated elegance.

I love pink. I agree that there are too many choices for this poll. It should be split so that each princess has a poll for her alternate outfits.

@wavesurf Yes, I think @jeangreyforever said it, but Ariel's pink ballgown isn't on the poll because it's the dress she's often marketed in (that and her green redesigned dress. I don't know what country you live in, but in England it's more common in Disney Stores to see her marketed in pink rather than green.) I might do a poll for the princesses "main" outfits at a later date, though, so her pink dress will be an option be on that.

@xanara I love Cinderella's pink dress too! Tiana's blue dress just edged above it for me, though. And I didn't split the poll because some of the princesses only wear one or two outfits, so for them there wouldn't have been enough choices to make a poll. I agree that maybe I didn't think this poll through, though; there are a lot of choices, and I also love more than one!