i'm dreaming of a sellier/rigide black kelly in box or chevre with PH. wondering if box could ever be 'casual' so i could wear it with jeans and tee. can chevre be 'casual'? what size is good for me? i'm 5'4 115 lbs. would want everday bag and i only carry french wallet, small makeup pouch, cell, keys, sunglasses. am thinking 32cm. how difficult is it get this bag? thanks for any advice!