"Trappings of wealth" refers to all of the external signs or marks of wealth. For example, if someone is wearing a very expensive tailormade suit, an expensive watch, drives a Lamborghini and lives in Beverly Hills, you could say that they are decked out with or display all of the trappings of wealth. A more modest wealthy person, such as Warren Buffet, can live without the trappings of wealth. "Trappings of office" is another common expression: a private limousine and a personal jet belong to the trappings of office when one is president. Originally, "trappings" meant all of the ornaments that signified the wearer's status: the king's robes and crown, the bishop's crosier, etc. I hope that helps.

"She sported manicured nails, wore designer clothes and drove an Audi: all the trappings of wealth, an yet in her heart she could not be happy."