Kids come in all sizes and it can sometimes be difficult to choose the right size. I recommend referring to the width measurements in the pattern and compare that with a garment that already fits the child.
You can also refer to the size chart below. A size 74/80 will fit a child measuring between 74 and 80 cm in height. If you don’t know the child’s height, you can refer to the child’s age.
If your child measures in the upper end of one size, I recommend sizing up, as the length of legs and sleeves can easily be adjusted or folded to fit the child.
If you’re still not sure which size to choose. Please feel free to contact me at firstname.lastname@example.org