The Monte-Carlo Beach takeover features retro loungers, designer umbrellas, exclusive boutiques, and Mediterranean style through September.Aerial view of Jacquemus at the Monte-Carlo Beach.Credit: Monte Carlo SBMLuxury French fashion label Jacquemus is turning back time with a new 1950s retro takeover at an opulent property set along the border of Monaco.Inspired by the Riviera of old, the takeover will run through Sept. 27 at the beach club of …