Hopefully by the time your children outgrow the Oliver and s patterns, there will be a wealth of new patterns just right for them and of course for you to sew them.
My daughter has outgrown the patterns but I upsize just a tad further because she is still a bit small for the Liesl and co patterns. Being only eleven, nearly twelve it can be difficult to find something that will suit her tastes and mine but for now we have found a Jalie jeans pattern and are happy to go with the metro tee for ladies and that seems to satisfy her when it comes to casual wear. There is also Ottobre design magazine which has lots of patterns every issue and there are four per year for children up to 170cm.
There are of course the big four companies to turn to. Often it is the case these days where if we can’t find a nice boutique pattern we turn to them.
Some ladies here have tried the doe and deer range of patterns for their children and I know Nicole is a dab hand at these aswell as some of the lesser known patterns for men.
But I think that gradually over time you will see a steady supply of new patterns that would be ideal for your children when they reach that age/ stage of not being able to wear Oliver and s.