[Sabaron]

Worker's and Field gear are exactly the same with the exception of the Defense and level requirements.

These gears do not improve your results, they just reduce your chance of breaking a tool.

This is not information I've personally tested but various good sources on this site have stated this.

I mine frequently, and I wear my gears. They do not from my non-scientific observation appear to do anything other than prevent pick breaks. Sorry, Rare ores will still be just as rare as they were before you put on your gear.