“Of course it’s important, just not something you exclude someone from a community for, any more than say lashon hara which is actually an explicit lav. There is no section of Gemara or anywhere else discussing tznius dress, whereas forbidden speech is.”
CS: So if a Chabad Shulcha regularly goes shopping in non tznius clothing, they’d be no consequences and she’d be allowed to continue representing Lubavitch? What if she regularly ate in public chicken-and-cheese sandwiches? There’s no explicit lav against eating chicken-and-cheese. What if she regularly drove to her Chabad House on Shabbos?
Where are you drawing the line? Why a bathing suit no but a short dress TMI in public when she sits, walks, edited or perhaps even when she walks has no repercussions regarding her representing Chabad?
all bold are edits for the benefit of those who are/should be careful with their ears