No, actually, I learned from your mum. Not directly, but she sent me a book last winter when the Strettons were having me do all the cooking. It's called Mrs Blandifoote's Essential Household Spells Every Bride Should Know -- I think your grandparents gave her a copy when your parents first got married? It's simple household charms. The main reason she sent it was for the cooking section, it's full of really easy things you'd almost have to try to mess up, but it's got other useful spells and one of them is a lengthening charm for clothes.

I could try it but the book warns that if the clothes are nearly worn out, the lengthening charm might not take (or it might weaken the fabric so it wears holes faster).