Bright coloured boy's trousers!

www.polarnopyret.co.uk/collections/6-12years-trousers-shorts/products/unisex-green-kids-green-jeans-60456027-553

www.welovefrugi.com/kids-clothes/trousers-dungarees-shorts/+9-10-years/+boysboys

www2.hm.com/en_gb/productpage.0943747004.html?pr_oyster=hfrHQ3ku7Q&gclid=CjwKCAjwwqaGBhBKEiwAMk-FtBZ4BRdZhRoG9RXYBdBZYEUXvw2zXpu-GjexlpJIptudf_TlFmC3JxoCu1gQAvD_BwE

These are three of the places I shop for my 9 year old grandson who loves bright colours and patterns.

Good luck.

Also here:
www.childrensalon.com/sale/ss21?gclid=CjwKCAjwwqaGBhBKEiwAMk-FtNspkMuQ04YtIONSjCyu8GyEXiP8Yy8y7ba7JGGffp3JIAxd4fOl1hoCGLcQAvD_BwE

And the "outlet" of the shop above...

Also google "Mayoral" as we had some lovely mustard ones of this brand.

The more I think of it, the more places I remember!

I should probably add that he has x-linked ichthyosis, and doesn't like slim fit or skinny jeans. His skin doesn't shed properly and he has a tendency to overheat. It's a familial condition.

Ah yes, the H&M ones are slim fit but look at their others - and their joggers maybe. They had some lightweight ones last year.
My grandson had some soft organic chinos from there last year too - and I can't imagine they were slim fit...

There are actually quite a lot out there I think.
Good luck

Thanks for all the links Not spaghetti. We will just have to keep trawling the internet until we find some suitable trousers. As my DGS doesn't care for shorts, it is proving difficult.

Boden do chinos in bright colours, they might fit the bill. The sale’s in a couple of weeks, as unfortunately they are quite expensive.

Try Frugi. They go up to age 10. Not cheap but they do have a sale on at the moment.