Since today is Memorial Day in the US, let's talk about military dress. In these photos, you'll see hints of some of the key dimensions of men's clothing - color, cloth, multiple levels of formality (not just one!) and the peaceful coexistence of utility and ornamentation (e.g. regarding accessories).
Why is all of this relevant to men's clothing? Because military dress is probably one of the two or three most important historical sources and influences on men's clothing. I'll leave it to my informed readers to infer the others.