The only way I would recommend wearing a dress is if the straps are wide, no cleavage is visible and the length is almost to your knees or the same length that a skirt suit would be. I would also still wear some sort of cardigan or appropriate cover as well. Be as conservative as possible was the advice I was always given.
to be honest I would say invest in a skirt or pant suit. you have no idea how conservative an interviewer may or may not be, so always be mindful of that. I would still recommend getting a jacket or cardigan to wear over your arms if you go that route. People in class have worn dresses for presentations, but for the interview, everyone wore a pant or skirt suit. It just looks more professional imo, especially since some dresses can be clingly and too form fitting
Since I have been in pt school, I have seen countless interviewees in the cafe after their interview, and I can tell you that 99% of females wore either a pant or skirt suit.