Vintage circa 1940s-50s British workwear jacket.
 
Unlined white cotton stewards/ services jacket with contrast collar and cuffs that have faded to grey.  Hook and eye fastening at the stand collar and three patch pockets.   Tan change buttons to fasten. 
 
Small fray hole at the upper back, some inked writing/ numbers inside the collar, some scored out writing inside the front placket.  There's a repair at the armhole seam on one arm, some mottled marks inside and a few spots and marks on the outside, to be expected for a white coloured garment of this age.  Its a slightly greyish white (from age)- not a bright white.  There are inked letters inside the back collar. Some greyish marks at the lower front, some rust type specks at the back  and shoulders.  
 
Laundered. 

17 1/4" seam to seam across the shoulders at the back
Sleeves are 24 3/4"  from the shoulder seam to the end of the sleeve
From nape to hem is 26 1/2"
19 1/2" across the chest under the arms, the same across the back, measured flat, side to side, pit to pit 
18  1/2" across at approx waist height
19 1/2" across at approx hip height (this is a man's jacket originally)   
Collar is 14 3/4" when buttoned up