Chicago has a new triple threat on the theatre scene in the form of a hysterical French farce. Don't Dress For Dinner, which opened last month at pristine Royal George Theatre, gives us one the best written, best directed and best acted plays in years. Written by French playwright Marc Camoletti, (who is currently seeing phenomenal success with a West End and Broadway revival of his Boeing-Boeing ) Dinner was a smash hit in Paris in 1987, where it was originally entitled Pyjama pour Six. This English adaptation premiered in 1991 at the Apollo Theatre in London where it was adapted by Robin Hawdon.