I've read that the insignia was ordered to be worn on the collar as the photos show. In the Amtliches Nachrichtenblatt for the HJ-organization a special issue was pulblished (Sonderdruck 7/38) dating September 30, 1938 about the service-dress for HJ and DJ. It states that for the Hochland
Gebiet that all forms of cap would wear the Edelweiss. It is to be positioned in the middle of the left side of the cap, close to the lowest edge. Leaders were not authorized to wear the Edelweiss.
Orders about the Edelweiss for the Austrian HJ would be announced later.
The regulations from the above mentioned periodical dated June 16, 1939, more then six months later, on page 219, the text practically literally translated states:
The Edelweiss-insignia for the
Obergebiet Südost has to be worn immediately from now on with the shirt, the blouse and winterblouse, as also with all forms of clothings for the leaders and the highest leaders (Führerkorps) with the exception of the leaders greatcoat with black cuffs.
It has to be worn at the right lapel of the tunic or respectively the collar for the shirt in such way that the stem for the insignia has to point into the outer tip of the collar.
Credit to W. Saris for the above information.