The first pattern cap badges are 50mm high and 30mm wide with a slider.
ORs' Collars were lugged and issued in facing pairs to be worn on tunics from after the Corps' formation in 1920 until circa 1940 when battledress came in.
http://www.bbc.co.uk/staticarchive/2...e00b604848.jpg
The collars were also worn in No 1 dress
http://freepages.genealogy.rootsweb..../kittsdoug.htm
The sealed pattern card is here:
http://www.iwm.org.uk/collections/item/object/30102990 (dimensions for the cap badge is 51mm by 29mm)