The Smut Report: Ok romance people who know about fabric, please tell me: If a histrom hero spent many hours in the rain, would his coat be ruined? I read that and my gut reaction was "that's not how coats work" but is there something I don't know about wool or something?

Ok romance people who know about fabric, please tell me: If a histrom hero spent many hours in the rain, would his coat be ruined? I read that and my gut reaction was "that's not how coats work" but is there something I don't know about wool or something?