be in fashion
FASHIONABLE, in vogue, up to date, up to the minute, all the rage, chic, à la mode, trendy, with it, cool, in, the in thing, hot, big, hip, happening, now, sharp, groovy, tony, fly, all the go

[TahlilGaran] Dictionary of Contemporary English ▲

after preposition after something happens, or after a period of time has passed. After is used especially when taking about the past:
We went for a walk after lunch.
After an hour, we got tired of waiting and went home.
They got married just after Christmas.
in preposition after a particular period of time. In is used especially when talking about the future, especially the next few minutes, hours, days etc:
The concert’s due to start in a few minutes.
I’ll come back in an hour.
In a few years’ time, this place will look completely different.
within preposition after less than a month, two weeks etc has passed – used especially when the time seems surprisingly short: within a month/two weeks etc:
He developed a headache at lunchtime, and within two hours he was dead.
Within two days of arriving she had managed to upset everyone.
24 hours/a year etc from now at a time 24 hours, a year etc after now:
A week from now we’ll be in Paris.
afterwards (also afterward especially American English) adverb after an event or time you have mentioned:
Jones admitted afterwards that she had been very nervous during the game.
Speaking to reporters afterward, he said the operation had been a success.
He moved to Belgium, and soon afterwards he met Angela.
later adverb some time after now or after the time you are talking about:
I’ll tell you about it later when I’m less busy.
⇒ two months/three years etc later:
James went off, and came back ten minutes later with some food.
subsequently adverb formal after something had happened in the past:
The book was published in 1954 and was subsequently translated into fifteen languages.
fashionable popular at a particular time:
fashionable clothes
It was fashionable to have red hair.
His theories were fashionable in the 1980s.
trendy informal modern and fashionable – often used in a slightly disapproving or joking way:
a trendy tie
a trendy restaurant
The area has become very trendy and a lot of artists live there.
stylish adjective fashionable and well-designed in an attractive way:
She was wearing a stylish two-piece suit.
The furniture looked very stylish and modern.
cool adjective informal fashionable – used especially when you think someone or something looks good:
Michael looked very cool in his dark jacket and sunglasses.
a cool shirt
happening [only before noun] informal adjective a happening place is fashionable and lively:
London has always been a happening place.
be in fashion verb phrase to be fashionable at a particular time:
The Sixties look is back in fashion.

[TahlilGaran] English Thesaurus ▲

fashionable popular at a particular time:
fashionable clothes
It was fashionable to have red hair.
His theories were fashionable in the 1980s.
trendy informal modern and fashionable – often used in a slightly disapproving or joking way:
a trendy tie
a trendy restaurant
The area has become very trendy and a lot of artists live there.
stylish adjective fashionable and well-designed in an attractive way:
She was wearing a stylish two-piece suit.
The furniture looked very stylish and modern.
cool adjective informal fashionable – used especially when you think someone or something looks good:
Michael looked very cool in his dark jacket and sunglasses.
a cool shirt
happening [only before noun] informal adjective a happening place is fashionable and lively:
London has always been a happening place.
be in fashion verb phrase to be fashionable at a particular time:
The Sixties look is back in fashion.
in adjective informal fashionable at a particular time. In is not used before a noun, except in the phrases below:
Pale colours are in.
New York was the in place to be.
Yoga has become the in thing to do.

[TahlilGaran] English Thesaurus ▲

in fashion
fashionable
Very thin neckties have not been in fashion recently.

[TahlilGaran] English Idioms Dictionary ▲