These trousers are perfect for all occasions, a very light cotton and not too restricting so will keep little one comfortable. The waist on the trousers are elasticated. We also have matching bibs and hair wraps in Older Girl, Mummy and 0-3 Years sizes.Measurements6-9 months outside leg 40cm and inner leg 21cm9-12 months outside leg 42cm and inner leg 23cm 12- 18 months outside leg 46cm and inner leg 25cm18-24 months outside leg 50cm and inner leg 28cm2 Years outside leg 52cm and inner leg 30cm3 Years outside leg 57cm and inner leg 33cm