noun
the height of fashion; the cream of fashion
A somewhat literary set phrase meaning the very best or most stylish part of current fashion. Often used in commentary on clothing, design, or trends.
彼女のドレスは流行の粋を集めたものだった。
Her dress was the height of fashion.
この店の品揃えは流行の粋を極めている。
This shop's selection represents the pinnacle of fashion.
粋 alone can mean 'essence' or 'refinement', but 流行の粋 is a set expression; using 粋 by itself in this sense is rare.
Compound of 流行 (fashion, trend) + の (possessive particle) + 粋 (essence, cream). The phrase is a set expression; the exact historical derivation is uncertain.