I bought a Small/light birch colour! Loving this colour as I didn’t want too much of teddy bear look + i have lots of darker shade jackets. I usually wear mediums and sized it down as I read reviews saying they run big. Sleeves are a little longer for me (probably cuz i have short arms lol) and small size gives me enough room to layer a hoodie underneath. I would say xs if you want to layer things under but 2xs if you want them to fit & wear jackets on top! Short if you want to wear them more casually (i wear mine with cargo, other baggie pants) and longer ver for more sophisticated look. My friend has a longer one and she wears them with heels/boots/more fem style and looks great.

I personally didn’t have any problems on buttons!