Our school is in quite a difficult area and has a shirt/tie uniform, which I loathe. At any one time only about 5-10% of the students will be wearing it properly, and most of the rest look very scruffy with the tie so loose/low you can't even see it.
Even with yr7s it's a real struggle to get them to sort out their ties properly at the beginning of a lesson. (A few teachers bother, not many, and most give up the fight by the end of yr7.)
My opinion is it would be better not to have collars/ties if you're not going to insist on them being worn properly.
So what would be a better alternative?