looks like collar probably had some type of pin in at one point

Sleeve Length: 23" / Short - Label states a height around "170"cm

so just a visual note

with all soldiers being issued a canteen at one point or another

Does appear to be fine aside from this

British Army No. 1 Dress Jacket w/ Belt - Welsh Guards - Medium M65 looks like collar probably hadAt a glance 100% Wool Material 2 Chest Pockets & 2 Waist Pockets Button Closure Hook & Eye Collar Closure Engraved Welsh Guards "Staybrite" Buttons Belt Loops Shoulder Epaulettes Rank Slides Internal Lining Decorative Cuff Buttons Solid Black Colour Pit to Pit: 21. 5" Suggested Size: Medium Regular Label suggests a chest around 41 1 2" but appears to be tailored a bit smaller Sleeve Length: 26" Long Collar to Hem: 31" Modern Militaria Dated 2020