If he prefers jeans that are well-fitting, not too baggy or too tight, ensuring comfort, your man is very open-minded, action-oriented, and enjoys social gatherings. He is a bit absent-minded, easily forgets things, doesn't pay attention to trivial matters, and is generally easy-going. You might be able to boss him around, but remember not to be too restrictive, or he might "bolt" to hang out with his friends.
If he likes tight-fitting jeans that highlight the athletic body he is proud of, your man is extremely self-confident, loves compliments, enjoys showing off, and likes to be the center of attention. However, his ego is quite high; he might even be conservative. He often displays a patriarchal attitude, trying to make others follow him.
If he likes baggy, loose-fitting jeans, your man is a bit eccentric, dislikes criticism and judgment, and rarely cares about other people's business; he lets things slide. You shouldn't bother giving him advice, as he won't listen anyway.