I’ve been making jumpers for little boys. the pattern is from DMC and you can get it from here.
For this one for my nephew Jacob, I used the yarn and colours suggested in the pattern. Then I did a beigey/browny version for his little brother Harry:
Lastly I did a navy and white striped one in acrylic rather than cotton for my grandson:
I love how they have all turned out, especially the collar. The collar shows more clearly on the pale blue version; it is just left as an unshaped rectangle when making the front and then picking the stitches up and doing double crochet. The second row you increase on every stitch so you get enough stitches to fold over comfortably, but then you just keep going until the edges meet at the front, and sew in position. Very easy to do, but very effective. I think a good collar can make the difference between something looking professional or cobbled together!
Here are the 3 jumpers together: