What does Avant-Garde Fashion Really Mean?

How can we use the term Avant-Garde to promote good conversation in fashion? Does it just mean "weird clothes"? As always, please engage in some solid discussion in the comments. What did you learn from this video? Do you disagree with my approach? Am I oversimplifying art by categorizing things too much?
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Props to Fredrik Tjærandsen for his awesome show that’s featured in the thumbnail.