Leather is not always tough and dull. It can be supple and rich. Creative use of color and cut gives these leather jackets a strong focus by combining sharp tone and soft lines. And the blouson style looks terrific over anything narrow. In fact, these seasonless jackets are so stylish they can be thrown over just a big sweater or a T-shirt and still hold their own. CAPTION: Picture, Olive, rough-texture bomber jacket, $390, at Ann Taylor; gold Capezio unitard, $34, at Chorus Line. Cobalt blue smooth blouson jacket by Michael Hoban for North Beach Leather, $350 (matching skirt, not pictured, $225) at Garfinckel's; navy Danskin unitard, $33, at Stein's Theatrical and Dance Supply Shop. Black jacket with suede inset and exaggerated shoulders by Claude Montana, $1,400, at Cache; white Danskin unitard, $33, at Stein's. Steinmark gray motorcycle jacket, $179.95, at Cycle's Inc.; silver unitard, $32, at Backstage Inc. Red jacket with stitched waistline by Michael Hoban for North Beach Leather, $390 (matching skirt, not picutured, $165) at Garfinckel's; red Danskin unitard, $33, at Stein's. BMW MOTORCYCLE AND BELL HELMET COURTESY OF CYCLES INC., ARLINGTON. HAIR AND MAKEUP BY ROSS HURTT OF FLASHBACK. Photo by John Bowden