Now, this shirt is quickly becoming a favorite of my son's. My other son has requested one even. I think the thumb hole is their favorite feature, by far. It's definitely pretty cool! To go along with the pattern, they made a YouTube video for the thumb hole cuff instructions. There is a mini tutorial at the beginning if you want to make a cuff for any shirt, not just their pattern.
There is an accent piece on the sleeve, which is good for using up scrap fabric. However, I ended up using my main fabric for the accent piece because I didn't have enough of it for the longer part of the sleeve. By doing it that way, it looks more like a layered short sleeve.
I was really quite pleased with the pattern. It's always nice when a tester pattern works out the first time around, and only needs small tweaks. Now, this is a more slim fitting/athletic fit shirt. If you wanted it looser, I would just go up a size in the width. She has the option to print in layers, which I love! It saves so much ink and is a lot quicker to cut out since you don't have to keep track of which line to cut.