When something is fashionable, English speakers say that it's "in style".

When something is unfashionable, English speakers say that it's "out of style".

And when something is very unfashionable, you can say that it's "totally out of style".

A funny point to note is that using the word "totally" in this way is a little bit out of style now. This word was really popular with young people, especially teenage girls, in the 1980s and '90s. You can still use "totally" as an adverb, but just try not to put it in every sentence!