I can try it
A DECT headset has a noise canceling built-in function and is made for a call center (a lot of talking people near by near). Also the mic is really near to the mouth and you can have feedback over the ear-speaker.
A lapel mic, connected to a "body pack", is made to pick up raw voice which shall normally sound processed in other hardware (limiter, exciter, ...), but maybe it will work for you.
I have also a AKG Wireless system which works great (with a ear mic, relative invisible), but not tested in a very loud environment - and the mic sound quality is absolute top in normal circumstances.
The "body pack" has a mic mute switch and one AA-Battery holds 30 hours of use.
You can order such a system from a lot of music stores and if it does not your expectations you can return it.
How we said - VoxWav is also great, because you can also execute all commands by taping the command from a list on the phone screen if the environment is to loud to give a speech command - and it is cheap.
http://voxcommando.com/mediawiki/index.php?title=VoxWav