Your moto jacket needs to define your waist with such accents as a belt. Also, shoulder and zipper details on the jacket help to give interest to your upper body. A straight skirt works best at deemphasizing your lower body.
A dark straight or pencil skirt worn with a simple top will deemphasize your hips. Adding a draped style cardigan will give volume to your upper body and create a nice balance.
A button down shirt worn with a long flowing layered skirt will elongate your lower body.
A boatneck shirt under a moto jacket pairs well with a pencil skirt that has front seams. Best if the skirt is in a dark color to deemphasize your lower body.
A button down shirt can be worn under a fun top to draw the eye to your face. While a wrap skirt will give movement to your lower body.