Just a set of mid-range earbuds with inline mic, and a clip on the cord to attach it to my collar and keep the mic near my mouth. As long as the mic is clipped

Just a set of mid-range earbuds with inline mic, and a clip on the cord to attach it to my collar and keep the mic near my mouth. As long as the mic is clipped there, I've never had anyone complain about audio quality. I doubt it'd be difficult to find a similarly decent Bluetooth set. I'd be more concerned about Bluetooth range and reliability than the quality of the mic. Audio hardware for this sort of purpose is basically a solved problem. Usually connectivity or software issues interfere more with communication than audio hardware does once you reach a certain (low) baseline for hardware quality.