For Guy Ritchie’s newest crime-meets-action film “The Gentlemen,” about an American drug kingpin living in Britain and trying to sell his business, the director turned to his “Aladdin” team of costume designer Michael Wilkinson and production designer Gemma Jackson. But the backgrounds and looks they created had less to do with Arabian Nights than with an irreverent, heightened portrayal of the British class system seen in earlier Ritchie films like his career breakout, “Lock, Stock and Two Smoking Barrels.”