Last Thing
When styling yourself for your headshot it is very important that you stay with your personality and consider your audience.
If you are in a traditional industry like corporate business, government , legal, consulting or finance , then you want to choose a very traditional outfit that lets your personality come out. If you are in a creative field then get creative with your style and stay true to yourself.
If all else fails, always reach out to your photographer for advice or bring a few extra pieces to your shoot so that you can work with your photographer to choose the best option.