free 2T Small Fry Skinny Jeans Pattern by Titchy Threads. They still fit him well with some room to grow even though they are a size 2T. This pattern is so great and detailed. I love the way the pants turn out every time. I've used this pattern a lot and am in the process of making Henry some yellow shorts!
Jedediah Pants Pattern from Thread Theory. I got the PDF pattern on sale last winter. It's one of the only patterns I've actually purchased. I wanted a good men's pants pattern to make, so I would be sure to get a good result.