Creating clothing that cannot be photographed could be extremely lucrative as your clientele would consist mostly of the rich and famous. There are existing products that attempt to solve the problem of unwanted photos being taken, but these are still far from complete solutions.
People, especially celebrities, do not like to be photographed without their consent. Unfortunately, it is impossible to stop people from taking photos, especially large crowds of paparazzi, or photographers who wait in hiding. So it makes sense to stop the photographs from being developed successfully since you can't stop people from taking photos.
At the moment, products do exist (and seem to be very popular). These products are far from perfect though and only works on flash photography, and only really works if the flash is near the camera. So these products lose their effectiveness as soon as someone takes a picture without a flash or simply moves the flash away from the camera (as is common practice among paparazzi already). This is because these products work by tricking the camera into thinking it is darker, the camera then adjust according to the light and as a result the picture comes out too bright. This approach works, but limits the circumstances under which it is useful.
I've been trying to find patterns or material that might jeopardize photos. Creating clothing with these patterns or materials will theoretically mean that a picture taken of someone wearing said clothing will not be of usable quality.
Having clothing that is completely photo-proof might be irritating when you do want to have your picture taken. (This will probably not be a big problem for celebrities)
The success of such a product might provide criminals with a sort of "invisibility cloak" for security cameras.
Do you know of a pattern or material that could serve this purpose?
Do you have another idea of how to approach the problem of having unwanted photographs taken?