none of my friends carry designer bags, so i'm not worried there!
people can't help having the same tastes
it may seem like stepping on the other's toes only if she special ordered her bag and then you went and did the same too
and because LV has become so popular, so fast, it would be selfish of someone to call, say, a Speedy her 'signature' bag so that her friends can't buy it too, when everyone knows that everyone else has/loves the Speedy
just as long as you both don't carry it out together, then it should be fine