I read the same, apparently its a complaint some parents have made that Jasmine's costume is too sexy and inappropriate for young eyes.
1) Hopefully Disney keeps in mind some people are born to complain (if not this, it'd be something else..."The ice cream is cold").
2) Some people like to complain if they think they can get something out of it (which much of our society today is all about)..."My kids were traumatized and I thought we were at a strip club seeing Jasmine's bare stomach! But, perhaps if you comp us or cover the cost of our hotel we will be ok again."
3) A few might be angry wives, "My husband wanted to take a picture with Jasmine yet trying to get him to take a picture with me is like pulling teeth!" (bad marriage, no help there no matter what Jasmine wears).
And then the traditionalists and (often) a silent majority, generally suffer. I'm a traditionalist, so I'd be upset if they wanted to change Snow White's outfit.
The thing is, I was just there a month ago and to meet or see Jasmine, you had to purposefully go into a small building in Morocco (EPCOT) just to see her and Aladdin. She was never out just walking around somewhere, never in a parade that I saw, etc. Same with Ariel...who was wearing a dress (human Ariel) EXCEPT for when you went to her grotto in Magic Kingdom to see her (I forget which version of Ariel was in a parade that went by). So to meet them (especially to wait in a line), you must likely want to, know about them and their characters, and saw their movie. To play the "I'm offended or traumatized" card (to me) comes off as shady or illogical.
This last point of mine (I'll admit) is not 100% airtight because "just because it's a norm" somewhere doesn't mean Disney should bend to it (Disney should be a good family friendly place), but what Jasmine wears is a lot of clothes compared to some girls walking around at the mall or places today (or even going back decades) wear. And do they not take their kids to the pool or beach?
I might have visited Disney World at the perfect final time...no more Electric Light Parade at night (bummed but can live with), Jasmine getting a weird new costume, Ariel probably getting the same (straws starting to break the camel's back)...and I don't care for most of the rumors in the Frozen 2 script (camel's back possibly broken).