I’m not sure I understand why my wife’s avodah makes you glad. My comment was only to point out that just because people may not do something doesn’t mean they cannot. I’m pretty sure that was self explanatory.
I think another way to look at it is that stores should sell clothing that conforms to the highest levels of tzniyus for its community (ie. me’ah she’arim shouldn’t be selling skirts only 4 inches below the knee while in America skirts should only begin there).
At the very least the store owner should feel a responsibility to make sure that anyone who tries on clothing in her store should be allowed to buy it only if it conforms to the her own standards of tzniyus. How can I sell you something that goes against my own principles?
Those women that feel a need to dress for their husbands in private should be able to buy the clothing that they need in a private venue. The same way we deal with any other issues that are bein ish l’ishto.
The only reason I can think of not to practice this way is that maybe it would make women who are not interested in maintaining the levels of tzniyus of her community would end up going to a mall where she might buy even worse clothing.