まず第１に、流行はたちまち変わる。の英語

In the first place, fashions change very quickly.

Fashions change quickly.

Fashions change quickly.

Fashions are always in a state of flux.

a revival of things that used to be popular before; revival boom

follow the fashion [a custom, a precedent]

To incorporate the latest trends.

To incorporate the newest fashions.

I gave up keeping up with trends.

Don't follow the fashion.

Don't follow fashion.

The fashion will soon lose favor.

Fashions grow old and die.

I gave up keeping up with trends.

First of all, it is too expensive.

First, it's too expensive.

First of all, I make a pattern for my customer's feet.

the ultimate in fashion

I changed my mind and decided not to go on a trip after all.

a member of the now crowd

First of all, I like children.

They were in fashion for a time, but have gone out

They have had their day.

It was in vogue for a time, but has gone out

It has had its day.

They are out of fashion―old-fashioned―now.

It's already out of fashion.

In the first place, you should be punctual.

That is really popular at the moment.

I can't keep up with these changes in fashion.