You're looking for a Wireless Lavalier mic and clip. These aren't cheap by any means, they'll set you back most likely $150 and then some, and the quality of the audio you'd get from it would depend on the quality of your preamp and/or sound card. I'm not sure whether they sell wireless usb or bluetooth gizmos for this kind of thing.
Do you have a decent sound card? And what's your budget for all this? I'll try and pick you one out if you want, but you are looking at much more than a basic usb desktop cartoid mic, let me tell you...