Great quality, feel quite smart so will probably be kept for smart casual rather than everyday play wear! I've bought 4-5 for my not quite 4yo and he's probably 4-6m off them being the right length so they're pretty true to size I'd say.
These are great. I like the wide leg, as my son doesn't like clothes that he feels are restrictive. The elasticated and adjustable waist mean they fit perfectly and grow with your child. They are also very soft. The material and design are great quality. I love the little design on the pocket.