SofaKing's post sounds like my experience at school. Good attendance, well-behaved, on sports team, student council and straight As but my head of year only ever spoke to me to tell me to tuck my shirt in, threaten me with suspension over blue streak in hair, etc. I used to find it sad that she got so angry about something so petty. Our uniform was horrid, collar and tie, blazer that you weren't allowed to take off unless somebody fainted, etc., all at bog standard comp. Really uncomfortable especially once girls had started to 'develop' and always too hot or too cold!
Our local secondary wear black trousers, white shirt with tie and navy jumper - it looks AWFUL. Skirts/shorts are not allowed and they are very funny about shirts (blouses are not allowed, bizarrely - how can they tell?) so any arguments about looking smart go out the window here.
Have you seen a size 16 woman stuffed into a collar and tie with her SHIRT tucked into a pair of trousers at your place of work lately?
No, of course you haven't, because it's uncomfortable and doesn't look nice. Ties are stupid, my DP works in a govt organisation and never wears a tie even if he's meeting ministers. He wears smart shirts/trousers/shoes/jumper but not a tie.
I have no problem with the primary uniforms near us - polo top or shirt/blouse with sweatshirt/cardi in school colour or with logo and grey trousers/shorts/pinafore/skirt. They also allow trainers or boots to be worn which I think is great. The kids look smart but they're not being restricted by collars or sodding blazers.
BTW where I work there is a goth senior manager, she wears black lacy tops under black suits and black pointy boots, and there is a Rastafarian man in finance who just ties his dreads back and looks perfectly smart in his trousers/shirt/jumper, no reason why you can't be a bit 'yourself'!