I made size 2/3 and it is a bit big for Sam but he can grow into it. And to be fair, Sam is a pip squeak and still fits into some 18 mos stuff.
I love the lined hood the best...sock monkeys!
And a secret pocket...I bet he will like this best.
I used a knit fabric (pique) for the exterior and most of the liner because it is what I had on hand. When I make this again, I would choose a cotton quilting weight for the exterior and a softer knit for the interior (just like they suggest...cause they are good like that). Love it ladies...good job!!