Major

Very common fashion statement, no problem. By the end of the war, even lucky enlisted men started wearing those. They were unofficial then so all sorts of styles. has it got the M1916 Bavarian state collar tape edging?

Some follow:

Bavarian Feldwebel/Offizierstellvertreter without state tape border: I think this is a Bavarian Vize-Feldwebel because of the three chevrons (a Feldwebel wore four). He was no Offizierstellvertreter, because he had no silver braids around the epaulette, the sign for this rank

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Bavarian Unteroffizier with state tape border under his NCO Tresse:

[attachmentid=19858]

and a couple of staff groups just to show varieties and how many in a given group might have gone for the style:

[attachmentid=19859]

aside from the foolishness of NOT having enough pockets, the fashion probably came from British officers' tunics

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I've no doubt got many more in the bvast archive if yours doesn't match any of these.

(I don't suppose it's a NAMED tunic?...)