If girls go on a trip with an activity that wearing leggings, under the skirt of course, as an added value for Tznius, is also an issue of לא ילבש? Same applies for pajamas at night, as an added Tznius?
Hashem made the Jewish people a גוי קדוש, a holy nation. The general idea of Tznius is 'modesty'; this means that the parts of the body that need to…