What the creator and others are finding offensive is that a character largely defined by her resistance to such things and a desire to be independent (in many senses) is being primarily presented by Disney in a typical stereotyped, dolled up fashion entirely contrary to that intent.

Do you remember that one movie where Richard Stallman gets up and makes a speech about how once in a while people need to set aside their ideals so we can actually make a real profit?

If they DID make such a movie, would it bother you?

It would bother me, because the while POINT of Richard Stallman (as far as I can tell) is to be stridently opposed to ever bending on these principles. I don't have a problem with people who put profits above principle, it's that I have a problem with Richard Stallman doing it -- it suggests that EVERYONE should put profits above principle.

I see a couple minor stylistic changes made to what a character is wearing.

I guess I need to see the movie, and the part where it's made obvious that "this girl would never wear anything other than a black burlap sack, ever, ever in her life, even in the future after the story ends. Ever." But I still don't think it would constitute some offensive sexist outrage. It would just be an inconsistent portrayal.

Er, her original dress is a floor-length green velvet one. You're exaggerating more than a bit. And maybe you do need to see the movie, since there are multiple scenes about how much she hates wearing dresses like this.

Dress is lower cut than original. Waistline is considerably smaller than original, which emphasises bust (which probably hasn't changed) and hips / ass (which also probably haven't changed).