This is the classic British Army brown cotton T Shirt, on issue to everyone until 2010 when the Coolmax 'moisture wicking' versions were introduced.
This classic heavy cotton version still has a large following however, and we have a quantity of new unissued shirts in size XL, which measures a 44" chest.
New unissued condition, still in poly wrappers - recently released through disposal sales.
Supplied here sold as a pack of three, also available singly in a separate listing at £4.99 each.