Firstly, may we express our admiration for this denim dress. Denim jackets and denim shirts are commonplace, but you don't see many people trying the denim dress, and she's made it work for her. It might be slightly spoiled by the message on the back though - firstly because it looks like it's been painted on by hand, and secondly it could mean several different things.
Historically, the word 'hustle' has always meant 'to work hard,' and so it's possible that she could just mean that hard work brings its own rewards, which is true. In more recent times, though, to hustle someone means to deceive them, and usually to rob them of their money in the process. With that in mind, is she a hard worker, or is she eyeing up the woman with the umbrella, and thinking about stealing from her?