Choosing 70s oufits doesn't mean you're getting old or being conservative. In fact, it shows your ability of future prediction.
Fashions fade, style is eternal, you know fashion trends are like circulation, there will be the time it goes back to the basic, when one of the blooming seasons of fashion started.
When it comes to an 70s vibes, you might want to start with the iconic item represeting this style like flared pants. In order to prevent any fashion faux pax, let it become the guiding base for you to freely build up the rest of you retro outfits.
Find the pieces that make you feel you. 70s vibes is not only about the boho looks with button-down shirts and flared pants, do more research and you'll find out it could be a perfect duo of a fitted t-shirt with flared jeans or even a maxi dress - floppy hat couple.
If your outfit is all about simplicity and elegance, feel free to take some more accessories like a set of layered bracelet or wooden necklaces to amplify your appearance. Just enough to make people recognize you.
And when everything is done, finish your looks with a little cold sad attitude on your face then you are good to go.
Kieran shirt, similar here