Areivim: the gemara itself says that if you want to know the halacha, go see what the people are doing. The best rayah is to see what knowledgeable and shomrei mitzvos do and that is considered stronger than even a halachic proof. Bmakom shlacha refuyah byadcha pok chazi mai ama dvar. Also, ein lmeidin mhalcha vlo mehalacha lmayseh ella mimaaseh.
ShalominIsrael: The fact that anybody made an issue over denim skirts and sneakers which are absolutely 100% kosher halachically, and worn by the dati leumi crowd seems to indicate that some people have hijacked tznius for political ends. They are really not discussing halacha when they talk about tznius. They are really talking about how can we be sure nobody identifies us with “that other” crowd, because we are “better”.
This is the polar opposite of tznius.