the left eye when a beret or a caubeen is worn; the badge worn on the Tam O'Shanter sits above the left ear. Uniquely D (London Irish Rifles) Company of The London Regiment wear their cap badge over the right eye, on their caubeen. Troops from other services, regiments or corps on attachment to units with distinctive coloured berets often wear the latter with their own cap badge. Colonels, brigadiers and generals usually continue to wear the beret of the regiment or corps to which they used to belong with the cap badge distinctive to their rank. The Royal Regiment of Fusiliers wears a feather hackle on the beret, they are now the only infantry regiment to wear the navy blue beret. Hackles are also worn by other regiments with Fusilier heritage: e.g. other ranks of the Royal Welsh wear white hackles on their berets (inherited from the Royal Welch Fusiliers). The Royal Regiment of Scotland and the Royal Irish Regiment, instead of the beret, wear the Tam O'Shanter and the caubeen respectively, both of which feature hackles. The Tam O'Shanter is also worn by some UOTCs and Army Reserve units in Scotland. Prior to the adoption of PCS-CU, the beret was often substituted by the Mk 6 Combat Helmet with a DPM cover (or desert DPM if worn with No.5 Dress); this has since been replaced by the Mk 7 helmet with an MTP cover and some scrim netting for the insertion of additional camouflage. In jungle conditions, the helmet is usually substituted by an MTP bush hat – or equally, in cold conditions, an MTP peaked hat (Cap, Extreme Cold Weather), a rolled woollen tube known as a cap comforter, or other specialized headgear. When the British Army finds itself in peacekeeping roles, regimental headdress is worn (where the tactical situation allows) in preference to the helmet or MTP hat, in order to appear less hostile to local civilians. When working for the United Nations, soldiers will wear the pale blue UN beret. No.10: Temperate mess dress The British Army's temperate mess dress includes a waist-length short jacket, with which men wear trousers, overalls or a kilt; and for women a long skirt. No. 10 dress is normally worn by sergeants and above for formal evening functions. Colours vary greatly from unit to unit but generally match those of the traditional full dress of the regiment or corps.