I strongly recommend the Hiro Clothing Bundle at Daz:
http://www.daz3d.com/shop.php?op=itemdetails&item=3790&cat=3

It makes a good launching point. From there get all of the freebies mentioned earlier. That gives a decent base library, after which you can get more specilized genre outfits. Most of what is out there is at Daz, Hiro hasn't been as well supported elsewhere. Hopefully that will change over time.

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