Here are some free patterns I've found on the web for crocheting 18 inch doll stuff. Make sure to explore the patterns web-sites because you never know if I didn't place links to some of their patterns! Please also be sure to follow the giudelines these people have set up for using their patterns thanks!
A crocheted blanket for your doll. This project is a good one for begginners
A cute jumper to crochet for your doll
I have made this jumper twice already and still want to make more and it works up very fast
Mesh shorts for your doll
These sound nice I have not tried them yet, so someone let me know how they work up! (please=D)
All graphics on the 18 inch doll sites belong to Auntie at www.auntie.com except for the counters which are from www.vickimouse.com and www.toolzone.com