Er is een video tutorial: https://ikatee.com/pages/lobelia-lobelia-kids-sewing-pattern-video-tutorial

Kid's size range: 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 years
See size chart in the "Size chart" tab at the bottom of the page
Measures of the finished t-shirt: see in the photos.
How to adapt the pattern for taller and smaller women? See instructions in the guidebook .

Fabrics:
Knit: cotton jersey or cotton-elastane or viscose, interlock, rib
As an option, the sleeves can be made in a stretch mesh.
See required supplies in the "supplies" tab at the bottom of the page.

Tips: the t-shirt is designed originally with a simple hem at the bottom of the sleeve. If you want to make the bottom sleeve with an extensible bias binding, just : 1- cut the bottom of the sleeves by the seam value of the hem (you don't need this margin anymore), 2- cut an extensible bias binding of the length of the bottom of the sleeves (length measured flat), 3- align the bias binding along the bottom of the sleeves still open (before sewing the under sleeves); first put the open bias binding and the edge with right side together, then stitch, fold the bias binding and stitch on the wrong side.... then stitch the under sleeves together.