There was no official Girl Guide uniform in 1908 because there were no Girl Guides! Girls wishing to be Scouts adapted the Scout Uniform. It was usually a khaki hat with Scout badge and a long green or navy skirt (not shown).
In 1910, Baden-Powell formed the Girl Guides and asked his sister Agnes to look after the new organisation. A few years later his wife Olave became involved and in 1918, was appointed Chief Guide.
In 1911 the colour blue was introduced as a uniform. The tie was knotted at one end if the Good Turn for the day was still to be done.

By the 1920s there was a different look, shirts were commonly worn outside the skirt with a belt. This particular Guide uniform was used into the 1930s by a Ranger Guide (see lower badges on left arm).

A dark blue cotton dress was introduced for Guides in 1929 and was very popular throughout the 1930s.
However the skirt and shirt could also be worn as an alternative. In the 1940s skirts were worn shorter. This reflected the fashion of the period and the fact that material for clothes was scarce during the war years.