The UK Border Agency was the Home Office agency responsible for protecting the borders of the United Kingdom. Much of the work of the Border Agency is outdoors, operates 24/7/365, and is subject to the weather at hand.
To give Border Agency Agents an all purpose parka the Home Office had these high visibility parkas produced. Being water resistant these HiViz parkas protected agents from the weather. The HiViz elements of the parka provided agents with outerwear that allowed vehicles, traffic, and other agents to see the agent very clearly in low light or no light conditions.
Don't have your own border to protect? How about wearing one of these high visibility parkas when walking at night. These are made to current standards for visibility so you will be easily seen when wearing yours. As these are official UK government parkas they are also great for costumes or theater work for any scenario that is taking place in the UK.