and the Royal Regiment of Scotland amongst others still wear the infantry style of jacket. The colours of mess jackets and trousers reflect those of the traditional full dress uniforms of the regiments in question, as worn until at least 1914. Jackets are, therefore, usually scarlet, dark blue, or rifle green, with collars, cuffs, waistcoats, or lapels in the former facing colours of the regiments in question. In the case of those regiments which have undergone amalgamation, features of the former uniforms are often combined. Waistcoats are often richly embroidered, though with modern modifications, such as a core of cotton for gold cording instead of the thick gold cord which made these items very expensive prior to World War II. Non-commissioned officers' mess dress is usually simpler in design, but in the same colours as officers of their regiment. Most British Army regiments' mess dress incorporates high-waisted, very tight trousers known as overalls, the bottoms of which buckle under leather Wellington or George boots. Ornamental spurs are usually worn by cavalry regiments and corps that traditionally were mounted; some other regiments and corps prescribe spurs for field officers, since in former times these officers would have been mounted. The Rifles do not wear spurs at any rank, following Light Infantry traditions since historically no Light Infantry officer rode on horseback. Scottish regiments wear kilts or tartan trews, and some wear tartan waistcoats as well. In "No. 11 Warm Weather Mess Dress", a white drill hip-length jacket is worn with either a waistcoat in the same material or a cummerbund of regimental pattern. Blue and various shades of red or green are the most common colours for the cummerbund. Trousers or overalls are the same as in No. 10 Dress. Female officers and soldiers wear mess jackets in a pattern similar to those of their male counterparts over dark-coloured ankle-length evening dresses. Black hand bags may be carried, and black evening shoes are worn. Royal Air Force No. 5 Mess dress in the Royal Air Force is similar to that in the Royal Navy, except that the jacket and trousers are in mid-blue. For the most formal white tie occasions, such as state dinners, court balls and royal evening receptions, a white bow tie is worn with a white waistcoat (No. 5A). For all other evening events, a black bow tie with a mid-blue waistcoat (No. 5B) or a slate grey