A fashion trend.
shortlived
ephemeral
shortlived
Eggshells. =]
It is called Japan's fashion week .
The stage of a fashion show is called a runway.
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The phenomenon of sound bouncing off walls is called "reverberation."
Fashion planning is like,say if your having a fashion show and your have to plan it that would be called Fashion planning or if your a fashion designer you would need to plan the clothes.Anything that is involved with fashion and you have to plan for it that would be called Fashion Planning.
Fashion is a category or niche. The person who writes about relevant stuff of Fashion; is called Fashion Blogger.
fashion designer
This phenomenon is called dissolution.