Naval navy evening tailcoat undress mess uniform size 42

For sale here we have a very rare bespoke naval evening tailcoat. I think that they are called ' undress mess' tailcoats and are to be worn by officers for evening or mess events. 

Measurements 

sleeve - 24.5

shoulder - 18.5

length - 45

Armpit to armpit  - 21

Fit - 42 reg

Condition - Excellent