Reagan wasn't popular by default. He was popular because he was a master at debate, charming people, and framing himself as President.
For example, Jimmy Carter never looked Presidential. For one, he encouraged people to call him "Jimmy" rather than "James". For another, he'd wear a sweater when giving speeches to the public.
People liked that Reagan wore a sharp suit and acted (yes, acted) the role of President.
BTW, Obama, Trump, and Biden all were very careful to present themselves while campaigning as Presidential. They all wore sharp, well tailored suits, and took pains to stand up straight. I bet they all got coaching in body language.
US presidents’ suits tend to be generously cut (if not a full “sack” suit) rather than very well tailored. Viewed in this light Trumps suits seem to have been flattering if unstylish.
For example, Jimmy Carter never looked Presidential. For one, he encouraged people to call him "Jimmy" rather than "James". For another, he'd wear a sweater when giving speeches to the public.
People liked that Reagan wore a sharp suit and acted (yes, acted) the role of President.