Source : Webster's Revised Unabridged Dictionary (1913)

Natty \Nat"ty\, a. [Cf. {Neat} clean.]
   Neat; tidy; spruce. [Colloq.] -- {Nat"ti*ly}, adv. --
   {Nat"ti*ness}, n.

Source : WordNet®

natty
     adj : marked by smartness in dress and manners; "a dapper young
           man"; "a jaunty red hat" [syn: {dapper}, {dashing}, {jaunty},
            {raffish}, {rakish}, {smart}, {spiffy}, {snappy}, {spruce}]
     [also: {nattiest}, {nattier}]