So, it's too warm and the jacket would be an overkill but you can't do without the look of leather? Grab a Milwaukee Gambler Vest and you'll be all set to ride. With it's adjustable sides for a precise fit, pockets to stash your stuff and the abrasion resistance of leather you can look cool while staying cool.
Constructed of full grain durable leather
Snap front closure
Two zipper pockets in the front
Two front snap closure placket pockets
Laces up the side for extra comfort, style, and easy of wear