The dress code is business attire. For men, that means a suit and tie. Business attire is a little bit more complex for women. A suit is still safe but women can also wear skirts that look professional.
In general, it is best to wear conservative colors. You don’t want to wear eccentric colors. Black, gray, or navy blue is best. Avoid striped or polka dotted shirts. Solid colored dress shirts or blouses are best.