NORTHAMPTON — William Brideau, the new owner of the mens’s clothing store Jackson & Connor, remembers well his first suit (which he happened to purchase at Jackson & Connor.) “I was checking out somewhere, and the cashier said, ‘Did you find everything ok, sir?’ I did a double take and turned around to see if she was talking to anyone else behind me. It was the first time anyone had called me sir,” he recalled in a recent interview.