On a normal week, at least once a week, as my school has it as part of their mass uniform.
I know Catholic schools often require Mass attendance during the week (don't see the point in that really since supposedly you'd be going on Sunday anyway but whatever), but they make you wear a tie to it? Wow! Considering only olds would wear a tie to church normally.
Would kids wear a polo and kakhis to school normally either? It's called a uniform. I'll be soldiers, had they never joined the military, probably wouldn't be normally wearing a US Army uniform. Uniforms aren't meant to be normal.