Twenty-four years ago, I wore a "loud" shirt to a family wedding and since then no one has ever let me forget it. At every occasion, someone will say something about it, like, "You look fine today, not like at Sue's wedding, when you wore THAT shirt." Enough, already!
Etiquette dictates that the wedding guests (or their clothes) are not supposed to upstage the bride and groom.
However, you have achieved something every celebrity aspires to . . . an outfit so memorable that folks are still talking about it nearly a quarter century later! What Oscar winner can claim that? If you really want to put the kibosh on the remarks, wear the shirt again. When anyone comments, say, "Everyone has talked so much about this shirt, I thought they might want to see it again."