"Somehow, when I see you in your bike gear I always think of Michael Jackson."
You can always quit wearing the the bike gear and she can see what you look like in a coffin or hospital bed.
The other option is to put the high-visibilty stuff on your bike or the things you carry, rather than wearing it yourself. For example, I once bought a high-visibility vest that didn't fit me too well, so I wrapped it around my backpack, which it fit perfectly. I also swear by using a Planet Bike SuperFlash and other flashing lights on the back of the bike. The strobe pattern of the SuperFlash combined with other lights tends to get people's attention.