Your brand and business is important to you, let potential clients know that by how you present yourself.
Consider a who your potential client is when choosing your clothing and esthetic of your images. You want to be professional and friendly, but also approachable.
Do you want to portray yourself as professional or casual? Artistic or unique? What are other people doing in your industry? Do you want to fit in or stand out?
Wear what you feel comfortable and confident in. You want your images to represent you and your brand.