Bad news: I've tried shorts from half a dozen brands, and all of them have eventually worn to the point of being translucent.
Good news: It's taken longer than a year for all of them to get to that point. There seems to be a correlation between longevity and cost, with $75-$125 shorts lasting the longest. With the exception of Black Bibs, which last longer than you might expect given their comparatively low price. All IME, of course!