You do realize that Calvin Klein is also a designer???
The point is when you buy a better product that is made with better fabric and better care you are buying something that you plan to wear for a long time. Many people buy staples for their wardrobe and they don’t mind paying the extra bucks for something that will last a long time. An Italian designer who makes his clothes in Italy makes a quality product that you won’t get from a designer that makes his clothes in China. There just is no comparison.
However, someone your age should not be concerned about it because you are not thinking of buy a classic suit that you will wear for the next 10 years. It is not your mindset and it is not in your budget. You are not in that madreigah neighter mentally or financially so it is not something that should worry you. As a matter of fact, everyone should keep all their purchases whether clothing, cars or homes within their own means and own budgets and stop following the trends and keeping up with what others do. No one knows what goes on behind the other’s closed doors. No one knows what goes on in someone else’s bank books and to try to race them or keep pace with them is stupid.
Do what is comfortable for you, be your own stylist, wear what suits your budget and suits your personality and if you find some designer piece at a good price or even second hand and you really like it, go for it. Give it a second chance to shine with a new owner.