He was a gentleman from sole to crown
Richard Cory exuded all the characteristics one would assume about a gentleman. He seems refined, has good taste, and respects other people. He is a man the townspeople look to with admiration, so this line provides the impression of distinction about the subject of the poem.
Clean favored, and imperially slim
He is also well-groomed, taking great pride in his appearance. He isn't just thin but "imperially" slim, connoting a sense of royalty in his demeanor. The townspeople look to him as one would admire a king, with great respect and honor.
And he was always quietly arrayed
Contrasting a typical image of royalty, Richard Cory dresses in a muted manner, not using clothing to draw attention to himself. He likely avoids showy fashions and flashy colors. This presents a sense of humble character, which is reinforced in the following line as the speaker notes that he was "always human" in conversation, showing kindness in conversation.
And admirably schooled...
(The entire section contains 3 answers and 588 words.)