Does anywhere do slim fit elastic trousers?

[Sprogonthetyne]

Just that really. Until now we've used ASDA easy on for school uniform but they only do it in regular fit, which either fit at the waist and are to short or are long enough and like clown trousers on my bean pole DS.

Matalan?

H&M do slim fit pull-on school trousers. I think the slimmest style is in the girls' section, but they look unisex to me.

I'm not sure about what age they are pull on until, but M&S had several slim fit styles and they have adjustable waists.

Next do good ones

Marks and Spencer does.
Read product information to see the fastenings for each age
https://www.marksandspencer.com/2pk-boys-slim-leg-slim-fit-school-trousers-2-18-yrs-/p/clp60490632?intid=mobile_app_pdp_share