Black and white has always been the universal colors to wear for human resource employment for both men and women. But things have since changed. Colors are and should be allowed to wear for hr jobs interviews. They brighten up the office, the day, and your spirit. Make sure you feel comfortable in your clothing.
For Women in HR jobs it is ok to wear nice, bright colors but make sure you keep it under control. Stand out of the crowd but not like a sore thumb with a nice bright colored camisole under an all black jacket. Usually big printed things on shirts, jackets, or pants can cause an interview for an HR job to go bad. Flats keep it simple for you but why not jazz it up a bit. Heels are great for an interview for some reason it tends to give you more power. Think about when you are going for that human resources manager jobs what it would look like for you to stand tall and proud.
Men are fairly easy. Bright colored button down shirt looks awesome with a pair of brown, black, or any solid dark colored slacks. A pair of black dress shoes always pair well. Men make sure that you dress such which is acceptable. For example no sagging of the pants, black, or dark colored solid sock are best and a tie just tops it off. You can play with the ties, make them colorful, eye catching, but still comfortable and cool and that human resources manager job is all yours.
Keep in mind to dress for success means to impress.