If they can not by any possibility afford the coveted article, they buy some cheap, tawdry imitation, the effect of which is only to make them look ridiculous.

Young men of this stamp wear cheap rings, vermilion-tinted ties, and broad checks, and almost invariably they occupy cheap positions.

Like the dandy, whom Carlyle describes as "a clothes-wearing man,--a man whose trade, office and existence consists in the wearing of clothes,--every faculty of whose soul, spirit, person and purse is heroically consecrated to this one object," they live to dress, and have no time to devote to self-culture or to fitting themselves for higher positions.
The overdressed young woman is merely the feminine of the overdressed young man.

The manners of both seem to have a subtle connection with their clothes.

They are loud, flashy, vulgar.