Officially the tent hat was worn with Service dress but it was interchangeable with the SD hat. But as you can see from the attached photos the 8th Hussars and more recently the Irish Hussars and QRH also wore the tent hat in the field.
It is a great design for wearing with headsets!
In the western desert, A Squadron in Normandy in 1944 and more recently in Basra.
J
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