I found the pattern in Zoe Mellor's book Adorable Knits for Tots. A couple years ago, I made this sweater for his older sister from this same book.
I found this cute Ships Ahoy! sweater pattern and I knew I wanted to make one for Zach. I had intended to make it with the boat and fish. I ordered the yarn online. The yarn looked more blue on my computer screen. When I received the yarn in the mail, it was more green than I wanted. I decided to alter the pattern to have a Z on it, but I really like how it turned out.
If you want to see more details about this pattern, please see my Z-Man Sweater project page on Ravelry. Be sure to take a look at some more of my knitting and crocheting projects on my Ravelry project page.