Her playing wasn't good either, so maybe the dress served as a trick to shift people's attention from her performance somewhere else? Who knows. I'm not sure that she did it on purpose, though.
Sure, we all know of lady organists who change dress twice during a recital but usually they are exceptionally remarkable performers as well (and to be fair, men organists might also have the most bizarre outfits sometimes. It includes haircuts too).
So it seems to me that the extravagant appearance has to be earned. It has to be earned by hard work and relentless dedication to the craft.
Until then, try to stand out with your work, not with your looks.
Of course, feel free to program your recital to be remarkable. This is an entirely different story. When the work you do cannot be mistaken with somebody else you become your own category and you will not fear any competition.
But your look is not a shortcut to trust (unless your outfit serves the purpose).
Modulation from Eb Major to F Minor: I-V43-I=IV/IV-iv6-ii43+-i64-V-V7-i-iv64-i