Yes, it is. It works well in 1. In two, I'd prefer to say, 'He's rich, as isclear from his clothing'.
I agree with Ahmed's answer. When we say that X is clear from Y, we mean that Y makes it clear that X. Thus, "It's clear from his behavior that he's a fool" means that his behavior makes it clear that he's a fool; and "It's clear from his clothing that he's rich" means that his clothing makes it clear that he is rich.
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