I know a lot of skaters wear Lululemon clothing, so be aware that some of their recently-sold pants have been recalled for being too see-through.
http://news.yahoo.com/lululemon-recalls-yoga-pants-too-revealing-110510691--finance.html
Wear black tights under them. Problem solved.
+1 to that.. I wear black tights under almost all of my skating pants. It's funny because if I try to skate without tights on, I feel all weirdly out of place.
Although, actually, I read that they pulled them from stores. Not to worry!
And I can't skate without tights, either--even when I wear leggings.