respects as 3A but with the addition of a navy blue woollen jersey. Shoulder boards may also be worn with 3C dress. The beret may be worn with this dress only on certain occasions. No. 4 dress The Royal Navy Personal Clothing System (RNPCS) was adopted navy-wide during 2015 after being tested beginning in 2012. It is similar to the British Army's Personal Clothing System Combat Uniform (PCSCU), but in navy blue instead of multi-terrain pattern. It is divided into two categories: Number 4 dress, which consists of a navy blue fire-retardant jacket (worn tucked in and with the sleeves rolled up or down as personal preference), navy blue beret, navy blue stable belt, navy blue fire-retardant trousers, steaming boots, navy blue T-shirt and an optional navy blue microfleece, and Number 4R dress, which is the same only without the jacket and with an optional baseball cap, to be worn at sea. The peaked cap or sailor's cap may be worn with this dress on certain semi-ceremonial occasions. As of 2020, the Royal Navy has been testing a modified design that changes the top from a zippered jacket-like design to a buttoning shirt, with the rank insignia moving back to the shoulder position, and a removable, Velcro-backed name tape. The reasoning behind the changes to make the uniform more comfortable to wear in warmer climates. The RNPCS replaced No. 4 Action Working Dress (AWD), which consisted of blue shirt and trousers, both with flame retardant properties, worn with pullover (optional) and cap or beret. Specialist badges are worn on the sleeves; each branch and specialisation has its own insignia and are to be worn accordingly. This is worn by all ranks and rates. No. 5 dress No. 5 refers to the wide range of job-specific working kit worn by different personnel (e.g. medical, flight deck, boat crews, chefs, divers, etc.) for particular tasks. They are worn as required for duties. White uniforms In the tropics on formal occasions officers wear a short sleeved white bush jacket with an open collar and shoulder boards, matching trousers, peaked cap and white leather shoes. Like temperate number 1 dress, it is divided into three categories: 1WA (with medals and when bearing arms), 1WB (with medals but when not bearing arms), and 1WC (with medal ribbons rather than medals and when not bearing arms.) Officers above the rank of commander, and those holding certain