Does anyone know where to buy jeans for very tall but skinny boys? I have an 11 yo 5’6 (at least) and 22 inch waist. M&S do school trousers to fit him in extra long length but not jeans. We’ve outgrown age 13 jeans in length but now I find that next size up is far too big on the waist (and without elastic to adjust) but still not long enough. Where can I find jeans for him?