It's McCalls 3940, a maternity pattern, I'm starting early to build my wardrobe for when we're ready to have number 2, I got very depressed over lack of maternity wear last time around.
The actual project shirt is this one:
Simplicity 4583. As too large the previous shirt is this one is too small. I actually expected it to be a bit tight (I'm loosing weight at present so went down a size in hope) but not as tight as it came out, I will be putting it in the bag with the other things I'm working towards fitting into and looking forward to wearing it sometime soon! I am very happy with the way it turned out though, the fabric is Fair Trade organic cotton.