Hi ,I have only just picked up on your thread ,you may by now have found the answers you required?
The nurses uniforms in the photograph look the same as the modern QARANC'S of today ,Red shoulder Capes and trim over Grey Dresses [I think the naval ones are navy blue ]and White Headdress and White Aprons.
The QUEEN ALEXANDRAS ROYAL ARMY NURSING CORPS is active and has its own website and museum,you may very well receive help in that direction .
Good Hunting