This just in, from Silicon.com:

A third party developer in Tokyo, Yamada Denshi, has developed an add-on to Vodafone handsets, intended to be used as a night filter to allow Big Red’s customers to take pictures with their phones in the dark.

Unfortunately, the night vision camera has an unexpected side effect – in the right circumstances, it allows users to see a lot more than they bargained for.

As well as taking snaps in the dark, the Yamada Denshi infrared filter sees through people’s clothes.

When attached to a high-end camera, the device can give the effect of seeing through some garments – it depends on how easily infrared can penetrate the fabric in question – and is reportedly particularly effective on dark bikinis.

This kind of thing isn’t exactly new:  Sony Handycams with nightshot mode were known to have a similar effect, and other such filters exist.  I’ve actually seen Japanese TV reports that give advice to women on what kind of clothing best blocks such cameras.