Both of the patterns I used are available for free online:
For the hat pattern I used Mrs. H’s Cowboy Hat from Ravelry. I hooked up 2 sizes and used DC instead of SC.
For the boots I used Hodgepodge Crochet’s Cowboy Boots. I’ve used this pattern before and loved it. I always hook up because I crochet tightly. This time I made the ankle part of the boots with DC instead of SC and I wish I hadn’t. It is much better to use the stitches as written for a better shape.