Commonplace-book. Formerly Book of common places. orig. A book in which ‘commonplaces’ or passages important for reference were collected, usually under general heads; hence, a book in which one records passages or matters to be especially remembered or referred to, with or without arrangement. First usage recorded: 1578. - OED
It was Oswald who asked Father to let us have pyjamas instead of nightgowns; they are so convenient for dressing up when you wish to act clowns, or West Indian planters, or any loose-clothed characters.