Henry Poole & Co Savile Row tailor Henry Poole & Co has dressed clients including former British Prime Minister Winston Churchill, the Queen, and supermodel David Gandy. Managing director Simon Cundey told Business Insider there are a number of mistakes men make when buying and wearing a suit. The key is to look at a suit as an investment. With past and present clients who include the likes of the Queen, former British Prime Minister Winston Churchill, and supermodel David Gandy, Henry Poole & Co knows a thing or two about how to choose the perfect suit. The first tailor on London's famous Savile Row and the inventors of the "dinner suit," CFOs, CMOs, CEOs and "chairmans of various financial institutions" are also among those who get suited by the tailors, according to managing director Simon Cundey.See the rest of the story at Business InsiderNOW WATCH: This 'Game of Thrones' themed hotel is made entirely of snow and iceSee Also:A photographer captured these dismal photos of life in North Korea on his phoneWhat abandoned Olympic venues from around the world look like todayThe most crowdfunded watch company ever is making $1,000+ luxury watches affordable for everyoneSEE ALSO: Winston Churchill's tailors told us he owed them so much money they sent a bill to Downing Street on his first day as Prime Minister — and it didn’t go down well