An SAS tartan was registered last week with The Scottish Register of Tartans, though as you'd expect of the army's most secretive regiment, the entire process has been conducted very much on the QT.
Although the commission was received some time ago by Perth-based tartan specialists House Of Edgar, it was only recently that the firm realised who its illustrious client actually was.
As muted as the regiment itself is hush-hush, the SAS tartan's predominant colours are Oxford blue and Air Force blue. It also contains red, white and green.
For those of an inquiring disposition, the threadcount is B52LB12G2R2W4.
However, don't expect to read about tartan sniper smocks in any upcoming Andy McNab adventures - the SAS tartan is not intended for action.
Nor will it start cropping up in kilt hire shops alongside its more familiar military cousin, the Black Watch tartan.
As the Scottish Register of Tartans notes, its use is intended for the exclusive wear of serving and former members of the SAS or those approved by the regiment.