The term 'Highland Topper' is a combination of two crossword solutions, TAM and TOM. TAM stands for 'Tartan Attire Manufacturer' and TOM stands for 'Tartan Outfit Maker'. These two terms refer to the traditional Scottish clothing industry, which has been around since the 18th century. The Highland Topper is a type of hat that is traditionally worn with tartan attire. It is usually made of wool and is often decorated with feathers or other embellishments.