Free images results:
 

Skirt pictures, stock photos and images

 
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Paddling Royalty Free Stock Image
Author: Marilyna
Pinup 7 Stock Photo
Author: Camptown
Girl Royalty Free Stock Image
Author: Alexk
Pinup 6 Royalty Free Stock Photo
Author: Camptown
Elegance Stock Photos
Author: Stipples
Childhood Stock Photos
Author: Mkartal
Childhood Royalty Free Stock Images
Author: Mkartal
Girl Stock Image
Author: Ichtor
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Mini skirt Stock Image
Author: Coprid
Skirt Stock Image
Author: Badahos