The attiny85 runs now at 1Mhz. I removed all the parts of the digistump, so I could use it as simple attiny.e

The pillowpart should be attached to the pants, and the 2 neodyms with the Shirt in between. The basic idea behind this was, that when the shirt or the pants are removed, the 2 contacts jump together and the microprocessor transmits a code. then it goes to sleep. 

The Idea was not bad, but I forgot en unknown variable in the scenario: My son :)

He saw, that I attached something to his shirt and immidatly he pulled on the two straps, so that the system was disarmed.
Now I know, that was not the best plan. So let me sleep a night over it.