Can the sensor be put into a regular pocket, instead of the special ReimaGO® pocket?
Yes, you can keep the sensor in any pocket. However, the activity data may not be as accurate as the sensor may move quite a lot inside the pocket if there are no press studs to attach it to. The best place for the sensor is close to the torso.
You can also use a ReimaGO arm strap to wear it with any kind of clothing. Strap is especially good for indoor sports.