If you are betting on a plunging neckline, let this be the only major skin revealing of your outfit. Or if you are going for a sexy slit showing some legs in a skirt or dress do the same. Don’t combine them both in the same outfit. Because if you do, besides looking too much skin revealing they will cancel out the effect of each other.
In another words, to maximize the wow factor of a plunging neckline or a skirt slit, let them be the star of your look alone. And by doing so, you will keep the look elegant as well.