There is usually one choice doing the work. A neckline. A waist pulled in cleanly. A heel that makes the walk across tile sound a little sharper.
She does not stack every trick in the closet. That restraint is what makes the outfit look expensive, even if it is only a black skirt and a good blouse. No fussing at the hem. No friend side-eye needed before leaving the table.
Men look again because the clothes seem familiar on her, like she has worn versions of this look before and knows exactly what it does.