For women, this generally means a suit or other similarly professional attire. Depending on the nature of the employer, you may also choose to wear a dress or pants. For men, this generally means a navy, gray, or other dark-colored suit, coordinated shirt, and a tie. You can never go wrong with conservative colors such as gray, navy, taupe, and black. Coordinate colors and patterns.
Women can accessorize a conservative suit with a classy scarf or a nice pin.
Some fabrics are more appropriate for interviews than others. Try natural fiber blends of wool, silk, or cotton over polyester or linen, which wrinkle easily. Your clothes should be fresh, neat, and pressed. Your hair should also be neat and combed, and your fingernails should be clean and trimmed. Women should avoid nail polish in flashy colors.