Okay so I live in the Dallas, Texas area. It is summer right now. I was wondering how often I should probably wash my stillwater economy kilt (likewise when I get them, how often I should wash my Stillwater Standard Kilts, and the Original Utilikilt). Also likewise in the winter how long can I go without washing each of the kilts I mentioned?

Finally, I was wondering if the Original Utilikilt can be machine Washed or if it has to be dry cleaned?