I ABSOLUTELY LOVE Mulan's, it's absolutely stunning!! HOWEVER, I do wish they'd gone with the color scheme of PP's user pic's dress!! THAT is the outfit that Mulan chooses HERSELF to wear, and truly represents her! It's always bothered me that she's out in her matchmaker dress since she hated it so much, and Ping wasn't truly her either! Let her wear the green, and she should have her medal for defeating the Huns somewhere in her costume.
Poca's has grown on me since I first saw it, but I think the satchel needs to go and her necklace needs to come back.
I'm a little worried about Jas & Aladdin's that are coming out in the next couple months, I've heard that Jas's is VERY "different" and that some people don't like it...
That being said, there could very well be changes to all the costumes after they've been out a while, impractical for performers/florida heat/look/comments, etc. Gaston got his costume tweaked a few times, all the princesses had signature shoes when their redesigns were released and now only Cinderella does. Aurora's whole dress had to go back to the fairies for more work for MONTHS afterwards. Im just hoping once Jas's is out they go back and fix Elsa's bodice! It just doesn't lay right!
Most of the redesigns have been to keep the costumes moving with the times, and keep the merchandise moving with times, and of course, money. A girl has Cinderella's old dress, goes to meet Cindy, sees her new dress, sees it in the shops in kids sizes, and automatically wants it, now you're buying more than one princesses outfit and not because of size either. I also find when I look back on the older designs that I am glad they redesigned them, they've been the same for so long, I do wish they'd been kept closer movie accurate for some though! (Ariel's new dress irks me the most....)