No conversion that I am aware of. You can buy them (from sources like DAZ - www.daz3d.com or the Marketplace here), you can make them if you know how ( I know that I don't) or you can see if there's any in the "free stuff" on sites like Renderosity and 3D Commune. Warning: you are more likely to find textures for existing clothing in the free areas and the Renderosity Marketplace. While these are great and useful and often beautiful, they won't work without the clothing object itself. Most of these will have to be purchased.