Yes...it has already happened to all of us! The feeling of putting on a brand new dress, walking proudly into a party and realising "that bi***" (yes because that is how you called her!) has the same exact dress as you! No matter how many times you hear "it fits you best" or "but you have better shoes" ... that feeling of DISASTER haunts you throughout the night!
.... So some will say, buy Vintage so that you limit your chances of spotting "her" or even "go for creative" ( and hence look like a human-circus!!) in order to ruin your night ... but that is not the only remedy!
Have a look at how Harvey Nichols' alternative to getting rid of your "same dress" opponent! Pretty creative no? If only it was possible...!