Literature Reference: The demeanor of a scholar-gentleman: his hat is well-fitted, his clothes are proper, and his appearance is good; solemn, robust, auspicious, expansive, broad, clear, and magnanimous—such is the demeanor of an elder brother. His hat is well-fitted, his clothes are proper, and his appearance is sincere; frugal, detached, supportive, upright, cautious, insightful, diligent, and attentive—such is the demeanor of a younger brother. Let me tell you about the demeanor of a scholar: his hat is plain, the strings of his hat are loosely tied, and his appearance is straightforward; steady, diligent, modest, and respectful—such is the demeanor of a scholar. Source from 'Xunzi: Fei Shi'er Zi'.