Looks like the buttons have been replaced with Queen Elizabeth II ones at some point

although these can of course be worn with suspenders or without either

likely a cotton and polyester blend

General signs of use / age as shown in photos but quite reasonable being 60 odd years old

British RAF GP Bomber Jacket w/ Thermal Liner - Medium 92S Communist Looks like the buttons haveAt a glance Wool & Polyester Blend Material 2 Waist Pockets Zipper Closure Shoulder Epaulettes Elasticated Cuffs & Waistband Detachable Thermal Liner Turnover Storm Collar Classic Air Force Blue Colour Pit to Pit: 21. 5" Suggested Size: Medium Slim Label reads 92cm 36. 5" S Sleeve Length: 24" Short Collar to Hem: 24" Modern Militaria Issued Early 2000's Genuine British Royal Air Force RAF Surplus Grades Grade 1 In good shape, some prior use but up for