Man of Mode II

In one scene, the titular hero, Sir Fopling, wishes Dorimant to study himself dancing in a reflection of a mirror: "Why hast not thou a glass hung up here? A room is the dullest thing without one [... and] correct the errors of his motions and his dress" (IV.ii). But Dorimant considers it a "shadow of himself." What might this illuminate the larger issue of international style and cosmopolitan foppery? Alongside my previous question, how might the quotations from English poems complicate this relationship?