I get that this runs small or it's European sizes. I ordered up a size and it is too big. The shoulders are too wide and it looks dumpy. I do not think the jacket runs small. Not at all. In fact, I would say it's roomy.

The sleeves are wide leaving plenty of room for your arms. They are not skinny sleeves. So, if your problem is usually with width of the sleeves or the shoulder width order your size. There is plenty of room.

The hood unbuttons. It is soft and comfortable and not too warm.