This is a Marimekko jokapoika shirt. It's from the 90s-00s, with a black tag, and is labeled as a size 38, which I've estimated to be a size M based on the following measurements: The combination of green, light green, and blue is unusual, and while it has the vibrant colors typical of Marimekko, it's a piece that seems to go well with any outfit. The first photo is the closest to the actual color. A spare button is also included. Here are the approximate measurements: Width: 59cm Length: 73cm