Clothes for 15 year old boy work experience

[OneSpoonyGreyWasp]

Hello, my son has work experience in a school and they do not allow jeans or tracksuit bottoms. This is all my son lives in.

What clothes could I buy him that are smart casual, that he would actually wear?

He is very slim and tall.

School trousers with an open collar shirt ?

My son loves wearing cargo trousers

Chinos - they don’t have to be beige!
School or suit trousers

Precisely. Don't buy anything.
School trousers, school shirt not done up at the collar.
Simples.

As he's at school he must presumably already have school trousers, he surely doesn't go to school in jeans or joggers?
He can wear school trousers and a plain shirt open at the neck, no tie.

I didn’t think about school trousers. Thank you