In 1916, the Irish Guards established a pipe band. The pipers' uniform was a mix of standard service dress and bandsman dress, and also included a khaki bonnet, saffron-coloured kilts and green hose. The khaki bonnet was named "caubeen" by the Guards pipers, and was similar to an oversized beret. Some sources have stated the caubeen's similarity to the Scottish tam o' shanter, but the two are different in appearance – the tam o' shanter retaining much more of a 'dinner-plate' effect on the wearer's head, while the caubeen resembled an oversized beret. The two had different quartermaster codes, meaning that the caubeen was not simply a tam o' shanter with the toorie cut off, but a purpose-made article in its own right. In World War II, a number of British army regiments adopted both khaki and rifle-green caubeens as their headdress, replacing the GS cap.