Try to avoid bright colors there is a small exception when it comes to doing a photo session in the fall. (they battle the subjects face for attention) and the camera will readily pick up the reflected light and render skin tone with a colour cast.
Also try to avoid clothing containing logos, slogans, or other distractions.
Then there is bold stripes, large designs and polka dots stand out and tend to draw attention from the portrait’s subject.
Avoid short sleeved tops or shorts. When arms and legs are exposed and there’s lots of skin visible, it can be a distraction from the main focal point of the photo – the face.
What to wear!
Personally I like white long sleeved tops and blue jeans. This combination works very well with the white background.
Black tops can also work well with a white background but this is a high contrast and leads to photographs with a very different style.
Also consider wearing a top that has an interesting collar and/or sleeves.
A top that has interesting textures (e.g. a sweater) can also add depth and richness to an image. If you will have more than one change of clothing for your session then consider bringing a variety of necklines, textures, colors, and undergarments to achieve a wide variety of looks.
Stick to solids and subtle patterns.
Simple and elegant is the advice when selecting jewellery for a portrait. The same applies for any other accessories that you wish to have included in your portrait.