AUSTRALIAN STABLE BELT COLOURS
There are no hard and fast rules on the colours for Aussie stable belts. For instance, 2nd Cavalry Regiment stable belt has two colours Green and White which bear no relation to the Light Blue/Dark Blue colour patch they adopted for wear in mid 1990's.
1st Armoured Regiment adopted the same stable belt as Royal Tank Regiment although the colour patch adopted by 1st Armoured Regt in the 1990's was a colour patch used by an Aussie armoured unit of WW2 who back then adopted the RTR pre war colours.
Royal Australian Signal Corps adopted the colour belt of the British Royal Signal Corps which are not the Aussie Sigs colour patch colours: White and Purple.
Aussie SASR adopted the stable belt of their British counterparts:22 SAS Regiment. No relation to any special forces colour patch.
10th Light Horse Regiment did use the colours of the WW1 10th Light Horse Colour Patch: Yellow and Black.
Each stable belt in the Aussie Army is designed at regimental level and depends on their priorities. Some use historic colour patch some not.
At a corps level, it appears the prevailing preference is to adopt the same stable belts as the British counterpart.
With thanks to Keith Dudley, RAAC soldier (retired)- served in A Sqn 8/13th Victorian Mounted Rifles and 4/19th Prince of Wales's Light Horse Regiment)