Why stay in the snow belt? Take a cruise to someplace warm!
Good idea now, and a popular idea fifty years ago. In 1963 even ocean liners were offering cruises. They had to. Jet planes had drained their transatlantic business.
The couple in this City National ad seems to have skipped the cruise and simply hopped a plane to Colombia.
Why would a well-heeled investor wear a business suit on vacation? Because that's the way it was in 1963. (Times were about to change, drastically.)