A pair of classic black slacks are an essential part of a woman's interview wardrobe. Invest in a pair of quality black dress pants that fit well and will hold up after many wears.
Once you have a good pair of dress pants, it's easy to dress them up, or dress them down. You can pair your dress pants with a button down or blazer for a formal look, or with a sweater for a business casual look.
With a bit of creativity, black dress pants don't have to be boring. Add a top with an interesting detail, like this heather-gray sweater with the wrap detail on the hem. It softens the look, and makes it unique.
Peep-toe heels with a moderate heel height, like the ones here, are fashion-forward but still tasteful. If you're looking to dress down your look, add a pair of ballet flats or loafers instead of heels.
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Prepare for the Interview: Interview Etiquette