I dont dis agree in principle with his posit.
I was trained in the UK, when coat and tie were mandatory for class and teaching,, but,, times have changed,and the more casual approach ( in states like Fla for e,g, ) has taken away the image, that all studios are comp. oriented .
The many chain studios I have worked in, as teacher and coach , also relaxed their approach to dress code ( not T shirts etc ) and one can see how much this is reflected, in a much younger clientele.
Now that may be co incidence but it has taken away the intimidation factor for the newer student .