Hidden cameras come in various shapes and sizes. However, when it is in the form of a button on the shirt, how the hell can you trace it.

Spy Button cameras can be implanted on a shirt and look just like a normal shirt button. These cameras are equipped with good memory, with some offering memory up to 4GB. Like a normal camera, this too can record audio or video. Available for close to 110 USD, this spy gadget lives up to its name.

You can check out this product at:
http://www.trademic.com/free-shipping-button-spy-camera-video-and-audio/item-22354.html