Kids clothes i.e shorts mainly (Netley Abbey SO31)

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