worn by junior ratings but 1C dress is worn instead. 2C, "red sea rig", is worn for informal evening wear on board ship. However, the black cummerbund is not worn by junior ratings in this rig. No. 3 dress This is the same as for Officer's No. 3 dress but with the relevant rate insignia and seaman's cap (or beret). Junior rates are only issued with short-sleeve shirts and are not issued with ties. Thus No.3 dress is divided into 3B (without jersey) and 3C dress (navy blue jersey worn over the shirt with the shirt collar out). There is no equivalent of 3A dress for junior ratings. No. 4 dress Junior ratings, in common with all ranks and rates of the Royal Navy, are currently issued the new No. 4 RNPCS uniform. No. 5 dress No. 5 is the collective category for all specialist working uniforms. They are worn as required for duties. These include overalls, dry and wet suits, physical training uniform, and dental and medical scrubs. Included in this category as well is the Multi-Terrain Pattern (MTP) PCS (personal clothing system) uniform. White uniforms For junior ratings, the white warm climate No. 1 dress is a white version of the traditional sailor's suit. The white warm climate versions of No. 2 and No. 3 dress are the same for the counterparts worn by officers and senior rates. However, only short-sleeved shirts are issued and worn and ties are not worn by junior ratings in these rigs. Defunct uniforms Full Dress Introduced in its ultimate form in 1827, but had steadily evolved from the undress uniform introduced in 1748; this uniform was worn by all commissioned officers from sub-lieutenant upwards, as well as warrant officers. It consisted of a blue double-breasted tailcoat with eight gold buttons worn with blue trousers with gold lace down the side, bicorn hat, sword belt and sword with scabbard, and gold epaulettes (gold 'scales' were worn by sub-lieutenants and neither epaulettes nor scales were worn by warrant officers). It was placed 'in abeyance' (i.e. not used but not abolished) in January 1916 until the end of the First World War. It was restricted between the world wars to court levees. On all other ceremonial occasions, Frock Coat (with epaulettes) was prescribed. In July 1930, officers of the rank of commander and above were required to provide themselves with Full Dress. It was again