I've the same problem with DS this year as last year - trousers which fit waist-wise are halfway up his calves.
I bought him a belt last year to keep trousers up but he is potty trained now and can;t manage the belt at nursery.
In addition the bigger trousers he's got which fit in length look like clowns' trousers on him - way to big in the cut.
Any suggestions for where to buy skinny fit please?