I'm not sure if the No.3 shoes are a big deal, since it's hard
to tell. 
But I do know that it's actually illegal to wear the uniform for
work (construction workers esp) or causual (Gord), its written in
the law or some Act somewhere.
Some years back the police and MPs cracked down on it for a while
when there were complains in ST, then with passage of time.. stop
enforcing it so hard...
Maybe someone should write into ST again? 