When you think about winter accessories what springs to mind?  Gloves?  Hat?  Fur?  Sunglasses?  You might not think of sunglasses as an essential winter  accessory (unless one is going skiing!)  However we have been enjoying some bright winter sunshine lately, even if it's drizzley as I write.   Not only are sunglasses practical in winter (protecting our eyes from strong UV rays) they have also become a huge fashion accessory for winter style.   Using glasses as a style statement is of course nothing new, but now certain celebs are rarely seen without them, some…