White bucks have again made a return as the summer essential shoe. As you may already know white bucks have been around for some time and have made a come back many times in the past, "in 1934, helping ignite another vogue for them as part of the debonair Palm Beach look. They came back again in the clean-cut 1950s and again in the prep-crazed 1980s. Now, if you listen closely — those crepe soles are quiet — you can hear them coming ’round the track again." (NYT)
As to how you would pair these, think summer suit. The pant should be shorter, showing off some ankle.