This may sound like a random comment, but what is it with backless attire worn by women? Why do they expose their backs and scapulas? Do the women who wear that backless attire like the elegant, smooth skin and shape of their scapula bones through their back-skin and they like to emphasize them; they want other people behind them to see their bony scapulas and smooth flesh on their back?

Maybe the back is exposed because it gets sweaty when it is covered up by clothing? That's the general logic for summer attire because sweat becomes rather sweaty at the shoulder blades. But the males are wearing regular full shirts.