SJSinNYC, no one says that a person has to dress like a “neb” to be Tznius-dik.
In the book, “Daughters of Dignity,” it is written:
“The Yetzer Harah tries to convince us that dressing B’Tznius connotes dressing drably. This is a grave misconception. . . A woman who dresses modestly, yet not respectfully, can cause a great Chilul Hashem, since she is projecting the Mitzvah of Tznius as unappealing and undesirable. Thus, those who see her will claim, ‘Look how unpleasant this woman appears. If this is what Tznius is all about, then I don’t want to dress modestly.'”
“Modest clothing and behavior is the epitomy of beauty. As it is written, ‘Jewish daughters are beautiful (Nedarim 66),’ for their outer modest appearance reflects their inner qualities.
Conversely, the secular world’s concept of beauty comes from the opposite end of the spectrum. Their styles are designed to spread immorality in the world. How can their opinion of beauty dictate our taste? How can we value what they think is beautiful?”
All that is being said is that the clothing should conform to Tznius, which is a Mitzvah, before conforming to what is “in style,” or “in fashion.”