I have been LOVING Sewing for Boys, the book. My favorite so far has been the Treasure Pocket Pants, although I have also made the Henry Shirt and Just Like Dad Flannel Robe. The Patterns by Figgy's Gals wrote the book, and I have also tried their Dapper Dillinger trousers (here again).So here is the Luka Hoodie. It is called an advanced pattern, and I think it was a bit easier than that. Although sewing the inside and outside together was a bit confusing at the end. It is nice how the seams are hidden, though.
In that same set of directions, I found an error (#5 in the construct the secret pocket section): they say to sew wrong sides together, but I needed to do it with right sides together.
how to make fabric covered buttons, even though they mention they are nice in the book (but not how to do them). I didn't end up doing it because I didn't have the supplies readily available at home. I think the wooden buttons look fine. I saw one blog review where she had added fabric behind the buttons to keep a draft out, and I wish I had known how to do that.
I found another error in the directions here: in creating the button loops, they keep telling you to put them on the right top panel but the photos and drawings all show these on the top left panel.
Also in this section, they have you leave an inch unstitched at the bottom. It is unclear why, and later, I found it to have no benefit, and I had to topstitch that area later. Maybe it was left open so I could attach the buttons while hiding the threads inside?
Henry Shirt for the same way. I think he'd fit better in the 4/5.