Made this with a rib knit for the main and interlock for the solid.
This is a size 98 for my daughter who is 3 1/2 years old and currently in size 3T.




I ironed stabilizer to the back where you sew the "band" onto. I also did not fold up and hem it on the bottom - I just did a rolled hem. If I did this shirt again - and I probably will I will read up a little more on the correct length for the neck band. They do have a formula in the Otto books, but mine seems just a little wonky - meaning it was probably too big.
Fun and easy though