Female Pilots - Unprofessional?
As students I don't think it's that big a deal. I've also learned over and over again that it's a huge mistake to judge someone's ability simply by appearance.
Some aviation sectors don't require that mindless drone attitude where it's an absolute necessity for each pilot to look like a carbon copy of each other.
Maybe in your opinion the aircraft is not the place to "flaunt" their femininity, but i hardly see how flat shoes and loose hair does that.
I think that it's ok to be whoever you want to be as long as you are professional, safe and hard working when it comes to flying and everything related to it.