Kids Clothes i.e Shorts Mainly (Netley Abbey SO31)

My son is 13 years old, has complex health needs and goes through clothes likes nothing.
He likes to eat them so they don't last long, I can't keep up with the amount of clothes he goes through, basically a lot. I'm not okay if his clothes have holes, elastic gone or no longer suitable as he wears, he goes through so much I just can't keep up and really could do with more clothes if anyone can help that would be a bonus. I wish I could buy it just can't afford it it's so expensive.