Mrs. 'Arris goes to Paris and Mrs. 'Arris goes to New York: by Paul Gallico

A simple kindhearted elderly charwoman who serves upper class bachelors in London by keeping their premises clean and is generous to her possible extent to her niece, and is content with her life on the whole. All she wants, if and when she permits herself to think of it, is a nice dress - a really nice dress, not an off the rack or anything in between but a really first rate dress from Paris. And then her adventures begin - first to Paris, then New York ....