Why do wet clothes become see-through?

I've had a burning question in the back of my mind since I went to a scientific meeting of ocular scientists down in Sarasota, Florida. There was this lovely young scientist from Budapest who forgot

see through wet shirt : non nude model forums (ONI8H1O1)

The Science of Water Security

The Science of Water Security

The Science of Water Security

Why does white clothing become see-through when wet?

The Science of Water Security