>>44244144At the very least, it looks to me (just based on the thumbnail) that the rest of everything is fully modeled under the coat, so it's not out of the question that it could come off, especially when we've seen it have the same degree of customization as the Live2D everywhere else so far (stethoscope and hat).
I'm hoping so, anyway, since hat on + coat off is the thinking man's favorite Ame outfit combination...