Vintage circa 1960s British chore jacket.
 
Made by Harpoon Brand, marked a vintage size 44.
Please refer to the below measurements.
 
Unworn deadstock, laundered once to remove storage dust and dressing. No wear to speak of. 
 

19 1/4" seam to seam across the shoulders at the back
Sleeves are 24"  from the shoulder seam to the end of the sleeve
From nape to hem is 27 3/4"
22 3/4" across the chest under the arms, the same across the back, measured flat, side to side, pit to pit 
22 3/4" across at approx waist height