Women can choose three to five bottoms and five to 10 blouses
For women, Savasuk recommended three to five basic bottoms with five to 10 blouses and shirts — or five to 10 dresses.
De Bease recommended two to three pants, eight tops, and two casual jackets or cardigans.
"With the addition of necklaces, earrings, shoes and scarves that suit your character and personality, and you can personalize these professional outfits to reflect your own personal style," Savasuk told Business Insider.
Men can buy three to five pairs of pants and up to 10 shirts
For men, Savasuk said to choose three to five pairs of pants with five to 10 high-quality button-downs.
"If ties are required, purchase a few that reflect your character and personality, so you can bring your own flavor to 'business professional,'" Savasuk said.
Stick to a few colors
Whether you're buying new pieces or just shopping your closet, sticking to mostly neutral colors is important.
Griffin recommended picking a neutral base like black or gray for most of your pieces, and a few articles of clothing in accent colors like blue or red.
"Everything should work together," Griffin told Business Insider. "You shouldn't have any closet singletons."
It might seem boring, but it's important so you can mix and match pieces. Having tops and bottoms in all shades of the rainbow is exciting until you realize you can only wear your striped yellow pants with the one black shirt you decided to buy.
When you pick your pieces, go for quality over quantity
"It is more important to have clothes that fit properly than to have tons of ill-fitting clothes," DeBease told Business Insider.
It might feel strange to know that you'll only have around five bottoms to wear. But spending $100 on a gorgeous pair of pants that you can wear all the time is far better than five pairs of $20 pants that will fall apart after a few washes and feel vaguely itchy.