I presume that you do not visit other grounds then ??
If anything (and it is only my impression of course!) the crowd at SMS is far less scruffy/chavvy than most places !
Given that we hold football matches there and not bl**dy fashion shows the standard of dress is exactly what I would expect !
Personally, I 'dress down' when I go to games rather than get 'tarted up', in fact, until now, I haven't really thought about it !