The difference between In fashion and On trend
When used as adjectives, in fashion means fashionable, in style, whereas on trend means having characteristics which conform to current fashion trends.
check bellow for the other definitions of In fashion and On trend
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In fashion as an adjective:
Fashionable, in style.
Examples:
"Disco went out of style in the 1980s, but is now in fashion again."
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On trend as an adjective (colloquial, fashion):
Having characteristics which conform to current fashion trends.
Examples:
"His fashion designs are very on trend."