I think you'd have to do a query to get it for users other than the current user. There's a function to fetch_userdata() in includes/functions.php, it checks the cache but also gets a lot of other things too, so I don't know if it's better to use that or just read the user table. Also I think things can override that value so it's really only telling you what the user has select for "Forum Skin" in their usercp.
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