Lilly & Liam has a relaxed fit without becoming too wide. The sweater has 6,5 cm (2 5/8”) positive ease which means that the chest width on the finished garment is 6,5 cm (2 5/8”) larger than the body measurement for that size.
In the table below you can see which size is recommended based on the child’s chest width. This is based on jersey fabric (cotton/lycra). If you’re sewing with heavier fabrics such as college or french terry, you should consider sizing up.