WW2 Gloucestershire regiment Parade cloak size 40 42 extra long

For sale here we have a very very rare Gloucestershire regiment parade cloak ( we think !) in navy doe skin and we suspect  circa ww2 although it could be before or after . We bought a dinner suit at the same time of similar proportions from the 30's modified to a 60's shawl collar style.  The coat is unique in that it features the double button row, one straight , one diagonal . A stunning example of a very rare military item. 

Measurements 

sleeve - 30, yes, 30"

shoulder - 20

length - 56

Armpit to armpit  - 27

Fit - The aforementioned dinner suit is 39 extra long but this seems much bigger. However... these are designed to go over heavy jackets and even overcoats. 

Condition - Excellent, a few marks to the lining but otherwise superb.