Natty: Stylish; dapper.
Tatty: Showing signs of wear & tear.
As in, “Old Joe the hobo went from tatty to natty once he found a job and befriended the nice saleslady at Woolworths.”
I don’t know about yall, but I’m feeling awfully tatty these days. I mean really, the negative temps have me wearing snow boots and hoodies to work and I don’t even care. I have a closet full of nice clothes but it seems like they’re all made of the thinnest material possible. Until May, nice clothes—I see you and raise my hood. Come spring, I’ll be feeling natty.