Children’s clothes get washed constantly and the construction needs to hold up. I’ve washed the Charlie shirts I’ve made at 40 degrees weekly for several months and the seams haven’t opened, the neckband hasn’t stretched, and the colours (I used prewashed organic jersey) have stayed true. I’m an intermediate sewer and the construction feels robust — the seam allowances are generous enough for repeated washing. Used the Letter file, sizes 4–5 and 6–7 for my two children. These have become the most-worn items in their wardrobes. Durable, comfortable, practical kids’ sewing.