I know I've said it before, so allow me to repeat myself. White suede bucks, as classically American as anything gets, may be a staple in the Summer wardrobe, but they carry on well into Autumn. I like mine a bit dirty, with tweed.
In the Summer, stick with topsiders and canvas sneakers. Save your white bucks for cool but sunny days when the leaves hit the ground. Thats when they really hit their stride.