To get the best shots, wear clothes that you often play in and are comfortable and well-fitting. Make sure that they are ironed and clean. Solid colors are the best, but it's most important for you to feel comfortable. Bring your favorite instrument (or two) and clean it well. I get a lot of pictures of your hands as you play, so clean under your fingernails. Hats, sunglasses, and other accessories are entirely optional, and can change the feel of a photo. Bring those as you see fit.
My best shots come when you're feeling relaxed and in the moment so I won't spend a lot of time posing you. I want to see you play and capture those moments. If you have a specific pose in mind,