To achieve the boy friend jeans style you will need to buy pants that are oversized a bit; and they pants have to go below your ankles. You can also sport this style by rolling the pants up and letting them hang above your ankles.
The kind of top that needs to be worn with oversized pants, is one that is really tight, to balance out the bagginess of the pants, and again to add that feminine touch as well. Always wear a tight top with boyfriendly jeans, because that is the way of the style. Keep it stylish!