You won't have any problems. I always clip my mics to my hat, and run the cables over my ears, and down into my shirt, and have never once had anyone notice.
One time I just attached a sony909A onto this shoulder strap of a leather coat- the mic was huge (relatively speaking) and the band was ANTI taping - no one even noticed.
Your biggest problems are a) getting past security, and b) checking levels. A lot of people run low levels while stealthing and boost the volume in post... but this doesn't get the full dynamic range... but it gets you a recording when you shouldn't have one.