Post (cancelled) Class- Habermas

In Jurgen Habermas "Modernity- An Incomplete Project", one of the first questions he raises is what the relationship between 'modern' and 'classical' is. In one of his first sections of his writing, there were three seperate quotes that got me thinking about this relationship between 'modern' and classical'. In the first quote Habermas writes, "Since then, the distinguishing mark of works which count as modern is 'the new' which will be overcome and made obsolete through the novelty of the next style"(Habermas, 99). This idea of modernity being constantly reinvented and redefined is really interesting to me. He then proceeds to write, "Our sense of modernity creates its own self-enclosed canons of being classic...The relation between 'modern' and 'classical' has definitely lost a fixed historical reference" (Habermas, 99). From reading this my question now is what is the relationship between 'modern' and 'classical'? He is writing that the 'new' or the 'modern' will continue to erase what came before it, so how can anything be considered 'classical'?
In fashion it is very common for 'trends' to repeat themselves in a more 'modern' way then they were previously worn. so in this sense, modernity has once again reinvented itself but in a new and more interesting way. Using this example of fashion, I then think about the 'classic looks', such as a cardigan. The cardigan has been dubbed as a 'classic' piece of clothing that is worn by both women and men. Over the years, it has been paired with different things, but the concept and style of the cardigan has not been altered. By using this example, I believe that modernity is based off of classical things. At one time those modern things were considered classic and they were altered or changed to fit the new times.