Masks are even more protective then Goggles and if you dont mind wearing one then you should do so. Unless you are a glutton for pain you should plan on wearing a long sleeve shirt, full length pants, boots, and gloves when you play Airsoft. Even a long sleeve cotton shirt can greatly reduce the chance of a nasty hit happening. Ideally you'll want to get ahold of old military fatigues or BDU's. These are ideal for use in Airsoft games.
Padded gloves are the best.
This will prevent accidental discharges of your weapon in areas that people have their masks and protective clothing removed. If you want to test fire your weapon then do so outside of the safe-zone. Failure to comply with this rule may get you banned from a particular plying location. Injuries can occur even when you are being careful. This one was from running through the woods during a firefight.