How to build the perfect summer capsule wardrobe for work

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.

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.

"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.

You could also layer a sweater or cardigan over a shirt to create a different look than wearing the shirt alone.

Simple black pants can play second fiddle to a variety of colorful shirts.

And, for women, different scarves and accessories can totally change the look of a simple outfit. The same goes for men and ties.

"If you find a few high-quality basic pieces that fit your body perfectly, you can mix and match those pieces with various accessories to change the look completely," Savasuk told Business Insider.