This is the Ella Raglan Blouse from I Think Sew (same pattern company that designed Zoe's cute overalls):
It's a ridiculously easy pattern that whips up quite fast and looks quite comfy. In the future, I could see lengthening it into a dress or adding elastic to the waist for a slightly more fitted look. Maybe piping on the seams between the body and sleeves? The pattern includes sizes for ages 3-8, so I foresee many more of these in the future.
Today's iterations include one made from some very pretty Amy Butler Linen Optic Blossom fabric (thanks, Jenny!):
And this sunny version is made from two Indonesian batiks, the body a beautiful yellow floral that I bought at Pasar Mayestik last week and the contrasting sleeves a cool pink batik that you might remember from this ruffle blouse and this Tiny Pocket Tank... I am getting my money's worth out of that piece of fabric!!