How much room for growth in the garment should there be?

Reima garments have around 6 cm room for growth, allowing base and mid layers, too. For example, if your kid is close to 104 cm tall in the autumn and is of a thin or medium body type, a size 104 overall should fit comfortably through the winter. However, kids can grow in spurts, so sometimes a larger size may be a wise choice.