Here is a speech of Polonius from Shakespeare’s Hamlet, act 1, scene 3:
Give every man thine ear; but very few thy voice:
Take each man’s censure: but reserve thy judgement:
Costly thy habits as thy purse can buy;
But not express’d in fancy; rich, not gaudy;
For the apparel oft proclaims the man,
And they in France of the best rank and station
Are of a most select and generous chief in that.
What is meant by the phrase, “apparel oft proclaims the man”?