Service Dress (British Army)
Service Dress was the new style of khaki uniform introduced by the British Army for use in the field from the early 1900s, following the experiences of a number of imperial wars and conflicts, including the Second Boer War. This variant of uniform continues to be worn today, although only in a formal role, as No. 2 Pattern dress.
In many of those conflicts, the bright red tunics worn by British infantry regiments had proved to be a liability, especially when faced by enemies armed with new rifles firing smokeless cartridges (this had been exacerbated by the white carrying equipment worn by the line infantry, the cross straps of which formed an X on the soldier's chest). The term Khaki (Urdu for dust) had come from India, where it was first worn by the Corps of Guides in 1846. During the Indian Mutiny of 1857 many British regiments took to staining their white tropical uniforms with tea leaves or other makeshift dyes in order to camouflage them. Rifle regiments had long used dark green uniforms (with blackened badges, buttons, and carrying equipment) as camouflage, and some units of the Volunteer Force's London Regiment had adopted Hodden grey uniforms for the same purpose. Numerous khaki uniforms were adopted by units in the field over the turn of the century, but the standardised Service Dress uniform was not adopted until after the Second Boer War.
Service Dress 
Other Ranks 
For Other Ranks (Enlisted Men), the SD uniform originally comprised khaki wool (serge) trousers, a khaki wool tunic, with stand-and-fall (or Prussian) collar, four pockets on the front, each buttoned closed by a flap with a straight (horizontal) edge, large, serge reinforcement patches over each shoulder, shoulder straps, and a pair of brass wire hangers on the back, over the kidneys, to support the belt. The front of the jacket was closed by five buttons, usually of a regimental pattern, arranged vertically. A peaked cap was provided, covered in the same khaki serge (including the stiff peak), with a leather chin strap (brown, for most regiments) held at either side by brass or horn buttons. This uniform was worn with ankle Ammunition boots, and, in the field, Puttees would be wound up (or down) the length of the shins to the top of the boots. The carrying equipment worn with this uniform was normally the 1908 web pattern, made of fabric, and also khaki (though a lighter shade than the uniform).
The Officers' Service Dress was completely different, except in colour. The cloth used was tailored and of more expensive wool. The jacket (not a tunic) had longer skirts and an open collar, for wear with a collared shirt and tie. The breast pockets were pleated and closed by scalloped flaps, while those at the hips had straight edges. There was a shoulder strap (or epaulette) on each shoulder, but rank was originally displayed on the cuffs, which were scalloped at the closure, and edged with herring-bone pattern khaki tape. Trousers or breeches,often of a riding style, and brown leather Riding boots were worn (even in infantry regiments, as officers traditionally rode on campaign). The carrying equipment was the leather Sam Browne pattern, brown for most regiments, black for Rifle Regiments.
Officers also wore a khaki peaked cap, and although similar to the men's with a cloth visor, was made of superior materials and was of better quality. Unlike other ranks, officers were expected to pay for their own uniforms, pistol, sword and Sam Browne belt.
Scottish Variations 
Scottish Highland pattern uniforms differed in the wearing of tartan kilts or trews, rather than trousers or breeches, and in alterations in the design of the tunic and jacket to make them resemble the traditional Highland doublet type - notably in cutting away the skirts at the front of the tunic to allow the wearing of a sporran. Additionally, most Scottish regiments did not wear the service dress peaked cap, but either the Glengarry or Tam O'Shanter.
Tropical Variation 
There were also lightweight uniforms for wear in warmer climates, known as Khaki drill. The Officer's was little different in cut, but the Other Ranks tunic was distinguished from the temperate service dress by having only the breast pockets. Both were made from a lighter cloth (both in weight, and in shade). Trousers were often replaced by Bermuda shorts. The same headdress was generally worn, however, if worn at all - pith helmets, covered in khaki cloth, continued to be the norm in warm climates up to the Second World War.
Royal Air Force 
The Royal Air Force's service dress was adopted in the early 1920s and is of a similar design to the British Army service dress. However, unlike Army service dress, RAF service dress is of a blue-grey colour.
The Great War 
This was the standard combat uniform of the British Army at the start of the Great War, and remained little changed throughout. With the numbers of uniforms produced, minor variations did appear, especially in the enlisted men's hat and the shape of the tunic collar. A soft version of the peaked OR cap was introduced, nicknamed the Gor Blimey. This was an attempt at conservation, but had the advantage of being able to be stuffed into a pocket or even pressed underneath the new steel Brodie helmet that began to be issued as the realities of trench warfare, and its attendant artillery bombardment, set in.
Although this was the standard combat uniform for the British Army and its subordinate colonial units (at least when serving in temperate climates), the armies of the Commonwealth countries (which originally referred to those with Dominion status) had their own variations on the theme. The Canadian tunic, by example, was closed by seven buttons, and it had a conventional tunic collar (all stand, and no fall), although the Canadian Officer's Service Dress was no different from the British Army's.
Officers' SD uniforms were modified during the War chiefly in that plain cuffs were introduced, with the rank insignia moved to the shoulder straps. The reason for this was that the old cuffs had made it too easy for enemy snipers to distinguish officers from men.
Scottish Highland regiments replaced the sporran during the war with a khaki cloth apron with a large, buttoned pocket where the sporran would sit.
Irish soldiers in Service Dress uniforms wait in a trench at the Somme, on the Western Front.
Field Marshal Haig, in Service Dress.
26th Battalion of the Second Canadian Expeditionary Force, 1915.
Bermudan officers and senior ranks of the Royal Garrison Artillery. Gunners did not wear 1908 carrying equipment, only a bandolier of ammunition for rifles used for personal defence.
The Second World War 
The Service Dress uniform continued to be the field uniform of the British Army until shortly before the Second World War, although many units continued to wear it after the start of hostilities, and many Home Guard personnel continued to wear it throughout the War. Service Dress was officially replaced as the standard combat uniform of the British and Canadian Armies, however, in 1939, with the introduction of Battle Dress. Service Dress continued to be used by officers, however, throughout the war as a walking out dress, and for semi-formal functions. Senior officers might rarely be seen in any other uniform. The Sam Browne belt had been replaced as carrying equipment for officers by the '37 Pattern web equipment, but continued to be worn with the Service Dress, usually reduced to the belt and one brace (worn as a cross strap), though a frog or pistol holster might be added as needed).
The Australian Army continued to wear its version of Service Dress as its standard combat uniform throughout the war.
Current Use 
Since the Second World War, Service Dress has continued in use as an intermediary between combat uniforms and Full Dress. It is also referred to as Number Two (No. 2) Dress. As worn today, the tunic has become a jacket, with an open collar for wear with collared shirt and tie, and cap, jacket, and trousers are all made from a smoother cloth than the rough serge. In some regiments a beret is worn in place of the peaked cap.
When Battle Dress was replaced with green cotton combat uniforms in the 1960s, it was used, for a time, for similar roles as the Service Dress. Men's stand-and-fall collars were replaced on BD blouses, also, with open collars for use with shirts and ties. There was no need for two different uniforms for precisely the same occasion, however, and only Service Dress retained.