Bikes withstand rain very well. You may need to increase maintenance frequency for your drivetrain a little. On a chain drive, I would clean and lube the chain more regularly if I were riding in wet conditions frequently. For a belt drive, I don't know what that entails.
For clothing; breathable, and impenetrable from any angle. As you're moving forward through the rain, the apparent angle at which the rain will strike you (assuming no wind) will shift from above to forward of you. So your legs will get wetter than you might anticipate. Some breathable rain pants and a breathable rain parka that doesn't interfere with your wheels would be best.
You've already got this covered, but fenders are an essential.