If someone dresses non-tznius, but will dress tznius to meet a Rov (or Moshiach), that is an indication that she is dressing non-tznius other times, and should mend her ways.
I agree wholeheartedly. If someone dresses not tznius (for example in tanktops & shorts) and will dress differently to meet a Rov, then they should dress Tznius at all times.
I’ll go even further. Even if she doesn’t dress Tznius to meet the rov, she should STILL dress Tznius at all times!
And people say I’m not a Machmir. I’m even more Machmir than Choppy! 🙂