I drafted the pattern from my TNT boy's shirt pattern and modified it to be fairly close to the adult McCall's.
Here's a closeup of the collar:
Isn't it perfect for a little boy who has a St. Patrick's Day birthday?
BONUS! Little Boy's Shirt
Three shirts in one day... I must be crazy or something. Anyhow, here's the little boy's version of the McCall's 3087.