Some of my 2 cents:
- Avoid like hell any shinny suits or small patterns (be careful even with mohair, studio lightning can be very crude), try to find a fabric that "drinks" the light;
- Avoid linen, the creases will be too visible;
- Avoid brown, it looks like hell with blue light (which is the main spectrum for studio lights these days)
- Avoid white shirts if you are pale skinned, you can look like a corpse - a little bit of tan and some make-up, mostly in the T...