Thanks for your ideas wvmarle, I'll definitely look into the various options you gave me!
Probably the easiest way to do this is based on duration of contact.
Using RFID to identify the gloves, along with a sensor to check for the duration seems like a good idea. What kind of proximity sensor are you talking about? I found a bunch of different ones but don't know what would work as I don't have that much knowledge in that area.