He became a citizen in triple denim.

There’s no such thing as too much denim.

Not a stitch of red or white in sight.

A fashion faux-pas is what is considered a style blunder. It is something one must not do, in order to not deviate from the societal norm, and spare oneself embarrassment. So they say. Concepts of what's fashionable and what's not, are subjective and ever-changing.