Trousers for tall but skinny 13 year old boy...where can I buy them?

[Mummywheel]

My DS is growing tall but not filling out, I'm having a real problem finding trousers to fit. Next were good upto 12 years as they have an adjustable waist band, but now they are simply too short. Please help!

I don't know where you buy the trousers, but I recently bought trousers for my tall and skinny 7 year old from M&S not realising they didn't have the elastic. My local sewing shop sells elastic with holes in for buttons. Put them in and only took 10 mins-so far he hasn't pulled them off!

We found Debenhams had some slimmer trousers, but TBH mainly concentrated on finding belts!