There are some free textures, and free clothes. Search free stuff. I recommend Rapheal, by kirisute. (Note the spelling - it's Rapheal, not Raphael.) A complete character, with clothes and props!

There's also the Pro Club, at PoserPros. It's not free, but it's cheap - $2.49 per item, no membership fee required. There's some nice clothing and textures there.