Garter toss...?

I am so confused! Does my groom toss my real garter or a different one? If he does not toss my real garter, then what are you supposed to do? I mean, do I wear both or do we do a lil' switch-a-roo? I would prefer to just switch them after he takes mine off...is this dumb and if it is not dumb then can you please give suggestions about how to make the switch? The two garters will not look the same so yeah. Also, I don't know where to find a big enough garter! I am not a twig which is what all the garters I have seen are for! Please help me with that one too! Thanks in advance.