I have this tunic and it looks like was used for a musician, due of shoulders where the cuffs connecting to it looks like had a musician shoulder insignia. The collar is totally different in color and looks like more violet in color, the ends of the cuffs has traces from a round insignia. The tunic has Kammerstempel 1915 year. Also all the pipings looks more grey to me, but by clear look in the seams it has more bright color and it looks to me more violet, like a sanitaer color.
Please give thoughts, probably that is a Verkehrstruppen or Train?