Frank Sinatra, "Lady Is ATramp" A Brief Interpretation, Please?

I have never really understood this song either Gerry! IDK...my best guess is that she (the Lady) goes her own way and does her own thing...in other words doesn't follow the crowd or what the other girls about town are doing! Maybe she is such a cly lady, that they feel a bit envious of her and feel the need to call her a (tramp) and put her down out of jealousy...in order for them to feel better about themselves and their own misdeeds!!!