A year or two ago I went on a vacation that took me to Italy, and I felt very underdressed in my what-fits-in-a-carryon clothes. What I noticed when I was there was that somehow the Italian men just knew how to wear clothes well.
I’m not someone who is very interested in fashion or who spends much mental energy on what I or other people are wearing (where I live, a frumpy middle-aged guy like me can beat the curve just by remembering to change out of his jammies), but I stopped what I was doing and watched passers-by as though it were a fashion show. I was impressed and interested and wanted to learn. I didn’t see much that was particularly flashy (though sometimes unexpected and bold color combinations) or that shouted out “expensive designer accessories and $150 shirts.”
FWIW, they almost all wore skinny-leg pants.
I also notice that all of your examples are modeled by thin, young men. Some examples that are suitable for less-thin, less-young men might broaden the appeal of your advice.