I skate in selvedge jeans all the time, but i only rock looser cuts cause those fabrics got 0 stretch. I wash mine regularly when they start to get dirty. All that "don't wash your jeans" bullshit is not true, washing is good since it makes your jeans hold up longer by tightening up the stitching and the fabric. The more often you wash your jeans, the lighter they'll become and the least "contrasty" the fades get, but that's not necessarily a bad thing, it's all personal preference. Bottom line is, wash your jeans.