And where does modesty “stop & start”?
I think that you are missing the point of the virtue of modesty. The koranimals force their women to cover, but in a civilized society with Judeo-Christian values, women choose to treat their bodies with respect by covering them properly in public.
I think the point of modesty is to avoiding cranking the engines of the opposite sex. Today, a girl in shorts that aren't *too* short and tight isn't going to turn on any guy but the most ardent sex-machine (who should probably sort out his own issues instead of expecting every woman around him to live in floor-length skirts).
Never reveal or attract attention to more than one asset at the same time.
You don’t know? Are you married? Ask your spouse. Ask your mom. Ask your dad. And seek wisdom.