I'm new to the B-bag craze. So I'm debating between a Twiggy and a Purse. I'd like a shoulder bag, but I don't think the Twiggy looks great on the shoulder. I've never seen a Purse IRL--how well does this sit on the shoulder? Is it a tight fit? Could someone give me the drop length from the bottom of the strap to the top of the bag? Thanks!