When did it start being so strict?! I remember being at school (started year 7 in 1997) - we had an awful brown uniform so finding anything "fashionable" that fit the rules was tough, and we had skirts measured from time to time (all girls school), but there was just enough flexibility in the rules to mean you had the chance to be an individual.
We had the choice of blazer or jumper, or both if you wanted. Yes, there was a no make-up rule before Year 10, one pair of studs and one signet type ring were permitted, as well as a small nose stud from Year 10 upwards.
We had to have black shoes without a ridiculous heel, although as long as they were smart the heel height didnt seem to cause too much of an issue. I wore trainers for a week after a PE knee injury - had a note off my PE teacher that I carried around with me in case another teacher questioned it, but only one ever did and she took my word for it.
God knows we all pushed the rules, as teenagers are wont to do, but our school's GCSE A*-C was 100%. I'm not sure how sending a kid home for wearing white socks instead of black is going to help them acheive their potential.
Yes, I'm all for uniform, and I agree school shouldn't be a fashion show, but if you make it completely inflexible then the kids will rebel - which is going to affect their education rather a lot more than wearing slim trousers will.