Natty is a word that while not commonplace, isn't rare in American English, at least where I grew up (in the Pacific Northwest). It travels a usage path along the lines of words like "mettle" or "mettlesome"--there is a distinct meaning, but because it sounds like something else (meddle or meddlesome) that those who aren't acquainted with the difference might misuse or confuse the words.

I'll read this thread closely later and say more then. It looks like you're delving into semiotics and etymology via a Google seat-of-the-pants approach. I might be able to find some scholarly sources that help you with this inquiry. Marley has generated studies and has a scholarly fan base that might interest you.

SRS