If you have a TV interview, you want to look the part of a serious and approachable author. Wear solid, neutral colors, like grays, blues or beiges. Media tips and tricks when it comes to clothing is staying away from loud colors or patterns of any kind.
Make sure your clothes fit well and are comfortable. The camera exacerbates the appearance of thick or tight-fitting clothes, or bunched material like ruching. Men should pay special attention to the fit of the jacket, having the jacket unbuttoned when seated, and buttoned when standing. Women should refrain from any tight, revealing clothes, paying special attention to how a skirt or dress lays when seated (hemlines come up when sitting).
As for jewerly, think simple designs and matte finishes, avoiding big or shiny pieces. Studio lighting reflects intensely off shiny objects, creating a distracting glare.