You may be living in the 21st century, but that doesn't mean you have to dress that way.
Shops that carry vintage clothing have always been around, whether selling used clothing (thrift shops, 2nd hand stores, etc.) or new clothing meant to look either old (though some sort of distressing) or like it's from another era.
While you can find hidden treasures at thrift stores like Goodwill and Salvation Army, you can find a more curated collection of clothing & accessories at dedicated vintage stores. These two articles talk about where to find the best: