Introduced in 1920 for wear on ceremonial occasions including Royal escorts. It could and therefore often was worn optionally at weddings. Its use was officially suspended towards the outbreak of WWII, although there are a number of photographs clearly showing it being worn by Air Officers post WWII as late as 1952/3.

Seven gilt buttons were evenly spaced to the front of the singled breasted tunic from below the collar and half an inch below the waist seam.  The tunic itself is made from fine Venetian cloth.

The skirt of the tunic was pleated and flitted with two gilt buttons to the rear.

There were three versions of the collar dependant upon the rank of the wearer. Ranks of Flight Lieutenants and below had a device of five oak leaves on the front of each side of the collar as per the example in the above image. Squadron Leaders to Group Captains had oak leaves and acorn running three and half inches from the front to the back, whilst Air rank officers had the feature running all the way round the collar.

Shoulder straps for all ranks featured an Eagle and Crown embroidered into the material. Officers of Air rank had the addition of a laurel wreath embroidered around the button of the strap.

Flying badges were full sized versions in gold and silver wire embroidery.

The sword belt illustrated in the above image is the second type introduced in 1921, woven in blue silk with two rows of gold embroidery on a backing of blue Moroccan leather. The plate fastener or buckle along with the other metal fittings were all gilded. The original belt was plain black leather.  

Rank was denoted in the conventional manner by the use of gold bullion lace on the lower sleeve .