May, I sew my kid's name underneath the uniform, so that noone can see. Just simple back-stitch with a single thread will do.
Mashy, I think he's turning 4 officially this year? Some schools have 2 levels of Nursery2 - N1 (3 yrs) / N2 (4 yrs), and some call N1 as pre-nursery or playgroup and N2 as nursery.
The role of the teacher is to assist and develop the child, and not make negative comments to the parent. Yes, 4 years-old (perhaps 4.5 onwards) should be able to colour within boundary... mine will colour within, and then go a little crazy and extend to the rest of the page. He learns from his brother, but a teacher once held his hand and guide him, and as she did so, she told him what's she's doing... that's what I call a teacher.
.ky.