Hey Chris,
Yeah pretty much what Chris H said.
The operas we did were in HD for cinema and DVD release,
so we had to hide the mics as much as possible.
Mainly in wigs and hair but there were challenges in a couple of shows.
One was the king and I with a bald singer, another had all leads in swimming costumes with nowhere to hide radio transmitter pack.
But the hardest one of all was Un Ballo in Maschera where the cast wore headgear for parts of the show. So a mic might start off in the hair for act one and be switched at some point to a lapel or under a blouse so that when they pulled off the headgear you wouldn't see wires and mics. It took about 2 days planning with assistant stage mangers and costume an wigs departments to see if we could actually do it. Here's a picture of said headgear.
A radio mic tech skit bag is full of skin coloured medical & clear plastic tapes to keep mics attached to skin that gets really sweaty during the performance,(those singers are really working hard) all sorts of hair clips, alcohol swabs scissors, and condoms. Some singers sweat so much the mics get drenched and stop working,and a cut down condom is the only way to stop it.
Tough gig.
http://www.google.com.au/imgres?imgurl= ... EEQMygaMBo