The shirt itself is not uncommon in design

Heavy Duty Cotton Nylon Material

but the cap is certainly much bigger and we'd suggest fitting a 58 - 59cm head | Suggested Size: Medium - Large

some signs of prior use such as the previous owner removing their medal ribbons

No holes or tears but there's a few grubby areas across the piece as shown

British Royal Navy Class II Jumper Sailor's Top - Medium 176/96 Pullover The shirt itself is notAt a glance Wool Blend Material Zipper Closure Blue Ratings Collar Iconic Sailor's Top Design Sea Cadet Corps Shoulder Patches Cadet 1st Class Sleeve Patch 1 Chevron Cook Steward Patch Pulling Competent Crew Badge Solid Black Body Colour Pit to Pit: 18" Suggested Size: Medium Slim Label suggests a chest around 96cm Sleeve Length: 24" Short Label recommends a height around 176cm Collar to Hem: 27" Vintage Militaria Issued Mid 1960's 1979 Genuine