In order to get the best audio possible, you need the microphone as close to the actor's mouth as possible. This can prove difficult in certain locations. In film school, I heard about a boom mic operator who would hide his microphone shadow on the beach by digging a small trench in the sand with his heel.
But if you don't have a clever boom operator and are sticking with body mics, you have to hide them on your actors. But where? While watching a movie this afternoon, I discovered one option:
Body Microphone Taped to the Leg
The microphone is only visible under her blowing dress for about three frames, but I noticed it because the wire flapped around for two-thirds of a second. Most people probably didn't even notice, which is why--again--little blunders and foibles are fine to leave in.
Taping a microphone to your leg isn't going to work for a beach scene where you're wandering around in a French cut Speedo, but it does work if you're wearing a skirt.
Your Media Production Mentor