Women do not have a comparable uniform, in part because women’s fashions are more varied and in part because women didn’t play a major role in classical performance in the years when these traditions were being codified. Yes, there were a handful of soloists. But for years, there were few women (if any) in major symphony orchestras, and virtually no female conductors. Female orchestra members and conductors still have to contend with the issue of what they should be wearing on a regular basis.
The criticism of women’s clothing onstage has been a red flag for me ever since Eve Queler said that when she started conducting in the late 1960s, her clothing so dominated her reviews that one critic complained that a zipper glinting on the back of her evening gown was distracting. This is obvious sexism. Unfortunately, the tenor of the discussion of women’s attire in this field has retained more than a hint of this sexist tone ever since.