This combat smock was issued during several UN missions which involved British peacekeeping forces during the fragmentation of Yugoslavia and was made just prior to the even more renowned S95 series of uniform

Chest Size: 40" | Suggested Size: Medium Slim - Label states a chest around "88"cm

so these are made to provide excellent protection against the elements

This particular shirt has an interesting history given the Footguards TRF sleeve patch

British Army Olive OG Utility Jersey Pullover Jumper - Medium 94cm Dutch This combat smock was issuedAt a glance 80% Wool 20% Nylon Blend Body Material Reinforced Elbows & Shoulder Patches Ribbed Wool Body Snug Fit but Stretchy Crewneck Design Length Designed to Fit All Sizes Heavy Duty & Hard Wearing Iconic Woolly Pully Style Classic British Army Olive Green Colour Chest Size: 38" Suggested Size: Medium Slim Label states 94cm Sleeve Length: 28" Regular Collar to Hem: 26" Modern Militaria Mid 2010's Onwards Genuine British Army Surplus Grades Grade 1