I have known therapists who were not concerned about their appearance. What difference does it make? I mean - for me, they need to not smell (but I don't get close enough to them that I could tell) - but that is about it. They could wear sweat pants for all I care.

It might be something to talk about - how OP worries about therapists or wants to take care of them - but how they dress etc is not up to anyone else I don't think.