Thus mess jackets can be scarlet, dark blue or green with facings and waistcoats in regimental colours. Two basic patterns of jacket are worn: the high collared "cavalry" style and the open-fronted one with lapels formerly worn by officers of infantry regiments. The version of No. 10 dress worn by officers frequently includes elaborate braiding on the waistcoats. Mess dress was derived from the shell jacket (infantry) or stable jacket (cavalry): a short, working jacket in full-dress colours, which 19th-century officers paired with a uniform waistcoat for evening wear. No.11: Warm weather mess dress A white jacket is substituted for the coloured one of temperate mess dress. Waistcoats are not worn. No.12: Protective clothing This order of dress includes various types of protective clothing ranging from the standard overalls to specialist kit worn by aircrews, chefs, medics and others. No. 12 also covers whatever day-to-day working dress may be authorised at a local or regimental level. Formerly an olive green shirt and trousers were often worn, but this has been replaced with combat dress shirt and trousers worn with beret and stable belt (identical to that of No. 7 Dress). No.13: Temperate barrack dress In 2018 it was announced that although Nos 13 and 14 Dress remain an authorised order of dress to be worn on appropriate occasions, Barrack Dress trousers, skirts and short-sleeved shirts were to be withdrawn. It consists of khaki barrack dress trousers (as issued under the Future Army Dress (FAD) programme) and the standard issued shirt from No.2 dress with a pullover sweater. The stable belt, a wide belt made of tough woven fabric, is often worn. The fabric of the belt itself is in regimental colours, either a single colour or striped along its length (the origin of these combinations is often traditional, derived from historic uniform colours and facings, and may coincide with the design of a particular unit's TRF). It is traditionally fastened with a set of leather straps and buckles on the wearer's left-hand side (in some units to their front), but may alternatively have a metal locket arrangement, or a plate at the front bearing regimental, or formation insignia. The stable belt is worn over the pullover by some Regiments and Corps. Some regiments' officers and WOs may wear coloured pullovers in place of the green pattern; the following regimental patterns and colours are authorised: Grey/blue v-neck: Royal Scots Dragoon Guards