They're entirely made of gaberdine cotton meaning they're windproof

As aforementioned the closure is a zipper system along with  popper buttons / studs

Engraved Princess of Wales' Royal Regiment Buttons

Shoulder Carry Strap

you'll find a decent amount of pocket space

British Army Red Tunic Jacket - Queen's Division Minden Band - Small Accessories They're entirely made of gaberdineAt a glance 95% Wool & 5% Nylon Blend Material Button Closure Embroidered Collar, Shoulder Boards, Cuffs & Tail Engraved Staybrite Buttons Iconic British Army Attire Belt Loops Bullion Thread Musician's Lyre Patch Gilt Thread Corporal Rank Patch Manufactured by Michael Jay of Suffolk Queen's Division Scarlet Colour w Black Edging & Gold Gilt Thread Decoration "OFFICERS TUNIC QUEENS DIVISION MINDEN BAND" Pit to Pit: 18" Suggested Size: Small Regular