School uniform

I was wondering how everyone else is coping.

Basically my son has to wear shirt, trousers and tie. He has motor skill issues and can't do buttons, zips etc.

The shirts I can modify by removing the top buttons and sewing on Velcro and replacing the buttons on top so the shirt looks done up. This way he can pull it over his head.

The trousers however is a completely different issue. After extensively researching this, it would seem that you can't get pull on trousers above age 6 (Not looked at specialist shop as the price goes up considerably). So now we are stuck with a zip and clasp. Any suggestions on what to do as I would like him to remain as independent as possible?

Dorthe