There's a free belt and dagger at GreyLight: http://www.greylight.com/poserclothing.html

In the pictures you've shown us, her pants look more like stockings.  If you're using P5 or P6 you could simply apply a black fabric material to the relevant body parts.  There are quite a few free fabric materials here in the Free Stuff section, at RDNA, and 3DC (www.3dcommune.com)

That's all I can think of for now.  Hope that helps. 

"You don't know what we can see
Why don't you tell your dreams to me
Fantasy will set you free." - Steppenwolf