I found this pattern through SouleMama and fell in love with it right away. The pattern by Jane Richmond and you can purchase the pattern at her Etsy shop.
Rather than using a more expensive yarn, I found a similar weight at Michael's for $4/skein. I was a little nervous about how much I'd end up using since the skeins weren't the same size, so I bought 8 and ended up using 5 (hoping that I can return what I didn't use!). After looking up a couple knitting abbreviations it was quite easy to do. It's knit from the top down, so it doesn't require seaming pieces together at the end.
Next time I may decide to make the body a little longer, and the sleeves a little longer with a bigger section of ribbing on them (like on the bottom). Can't wait for some cooler weather so I can wear it!