Day-Glo colors look weird. Jangly jewelry distracts. Wearing something with lapels makes it easy to attach a clip-on microphone. It can be really embarrassing to have someone threading a microphone wire down through your turtleneck sweater. If you have never been in a TV studio, you may want to arrange a visit prior to your interview, so you will feel at home.
Studios usually are large, and quite cool.
But be aware that once the lights come on, the studio will be VERY warm. There will be red lights going on, floor managers standing around with signs and people pointing at cameras, someone fiddling with microphones. If you try to figure out which camera is on you so you can look earnestly into the camera and talk to Mom at home, you will wind up looking like a rabbit caught in the headlights. Just focus on the person you are talking to. What You Want Be clear about your objective.