My 6yr old DS is tall (124cm) and slim and I'm having a devil of a job to find sweatpants to fit him. Even H&M ones fall off him and their trousers are normally okay as their waists are adjustable. I've tried all the usual suspects such as M&S. Next, etc but they're all too big.
I'm happy to adjust elastic in the waists but find the only way to do it with the vast majority is to unpick 3 rows of stitching, adjust the elastic and then restitch the 3 rows which is a real faff with 3/4 pairs! They used to just have a length of elastic within a 'pocket' but now the elastic is entirely stitched over with a number of rows. Grrrrrr!
Has anyone come across fully adjustable sweatpants for boys?