The uniform in the beginnings
With the change of name, members of The Salvation Army began to wear more uniform-like clothing. However this was often a self-made way of showing oneself as a member of The Salvation Army.
From 1883 onwards, soldiers were actively encouraged by the General, to be outfitted in specially prepared uniforms with insignia displaying rank.
Early salvationist
A uniform had a high standing collar and often jerseys were worn underneath, sometimes with either the crest or the name "Salvation Army" on it.
However many of the mostly not wealthy salvationists could not afford a uniform, so normal jackets were worn with appropriate insignia.
Therefore many salvationists did look similar to the salvationist in this photo.
However, very soon the officers had a relatively standardised uniform.