GPS lingerie brings with it a whole bunch of ethical issues. You could potentially locate a cheating wife, or use it in an escort service situation where a pimp can keep tabs on his/her girls, or even play weird GPS sex games if that’s your deal.
For better or worse, Lindelucy of Brazil has outted GPS lingerie that lets you keep track of where the wearer is at all times. Not what they are doing sadly for voyeurs. We shouldn’t worry about the ethical issues that much. The lingerie will be taken off in a matter of minutes.