Text: A sizable segment of this long curving beach of white sand is devoted to naturisme; almost everywhere else on the entire strand, toplessness holds sway in the current French fashion, but nobody insists on it.
Entailment: Nobody insists on toplessness in the non-naturisme sections of the long curving beach, but it is the current French fashion.
Contradiction: The entire long, curving beach is dedicated to toplessness, despite it not being a fashionable French trend.