c.1950's Vintage Belstaff 'Black Prince' Jacket & Trousers.
 
Jacket 
No visible size so I have taken the following measurements.
Arm pit to arm pit laid flat across the chest is approx. 26" as it has a bat wing sleeve. I'd say the chest was probably a 42 - 44".
Waist laid flat above the pocket line is 23" tapering down slightly to the bottom hem to 22 1/2".
Upper sleeve length from the seam of the collar over the shoulder to the cuff 31"
Under arm along the bat wing from the top of the belt loop, to the cuff is approx. 20 1/2"
Drop centre back from the seam at the base of the collar to the bottom hem 30"
 
Condtion: in good vintage condition, no rips tears of splits, soft and pliable. All the seams appear in good order. Light signs of use to the lining & collar.
 
Trousers
I would suggest these are also Belstaff trousers but they don't appear to have a label, they came alongside the jacket and are of the same manufacture. Original integral braces are still present which are sometimes cut off. 
 
The waist laid flat measures 21", they do have side tabs so could be made smaller but 42" is virtually at it's largest. 
Inside Leg measures between 26 1/2" to 29" as there is a section or panel in the crotch area which I have included half in the larger measurement, if that makes sense?
The outer leg measures 43"
Condition: These are a bit more worn although are still in good condition, one of the side waist buckles has some rust.
 
Weight: Jacket 2.25 kg, Trousers 1.58 kg  = 3.83 kg combined.