An extremely good condition P43 (4th Pattern) HBT Fatigue inOD-7.
Probably the last pattern featuring iconic 13 stars metal button before they swap for the brown plastic dish ones seen on the M1947. The Spec 45D features smaller and simpler chest pockets, gas flap and button attachment at the back of collar.
"JACKET HERRINGBONE TWILL, SPECIAL, OD SHADE 7 (SPEC NO 45D, 12 MARCH, 1943)"
Measurements: Sleeve Length: 59 cm Pit to Pit: 57 cm Collar to Hem: 69 cm Shoulder Length: 49 cm