Whether or not Orthodox Jews are going more right wing, that does not change the emes of the halacha. Either something is assur or it is not. either the rabbonim have always regarded something as not tzanua, or they have not. In the case of this fashion style, whioch goes back over thirty years or so, NO rov ever had anything negative to say about the look when it first came on the scene. They were very vocal about skirt and sleeve lengths, but apparently saw nothing untzniusdik about this look. The fact that some people are making an issue of it now, does not make their assessment any more choshuv than that of the rabbonim 30 years ago. Those rabbonim had eyes, too, and they saw what we all saw.
Not liking the style – that is a matter of personal preference. But it has nothing to do with tznius. You don’t like the look, don’t wear it. I don’t like the look of bubble skirts. To each her own.