Vintage British Military Jacket w/ Stand-Up Collar

Vintage British military jacket with stand-up collar. I don’t know what time period this is from but I’m guessing it’s mid-century. White, no material tag but most likely 100% cotton. Two front breast pockets, tab at throat, detachable buttons and small double vents in back. The cut is slimmer at the chest and then flares towards the hem. Yellowing around the collar and some marks throughout. Please review photos. Measurements: Pit to pit: 17.25” Length (high point shoulder to bottom): 28.75” Sleeve: 23.25” Shoulder to shoulder: 15”