Most likely the story is a tale of the two

This part is likely more for ceremonial use than active duty but given the wear it is possible it was used for both

Chest Size: 51" | Suggested Size: Large Regular - Label suggests a chest around 112cm

working in the now defunct Royal Army Ordinance Corps

British RAF GP Bomber Jacket - Large 107L Ceremonial Most likely the story isAt a glance Wool & Polyester Blend Material 2 Waist Pockets Zipper Closure Shoulder Epaulettes Elasticated Cuffs & Waistband Can be fitted with a thermal liner Not included Turnover Storm Collar Classic Air Force Blue Colour Pit to Pit: 23" Suggested Size: Large Slim Label reads 107cm Long Sleeve Length: 26" Long Collar to Hem: 28. 5" Modern Militaria Issued Early 2000's Genuine British Royal Air Force RAF Surplus Grades Grade 1 In good condition,