7. The newbie/pro combination

Newbies are usually accompanied by pros, who act as makeover consultants while their dowdy friend buys her first set of lingerie, her first pair of high heels, or her first cocktail dress. You can usually tell who the pro is by the distinctive clucking sounds she makes when the newbie reveals that she hasn't bought a new bra in three years, or when she requests that they stop at M&S for first-date wear.