If you are into western style, then you've chosen a path that will ultimately be a lot of fun. Although it's a serious thing for the original cowboys, I guess it's not that bad to spice up your wardrobe with more western wears.
These are some of western shirts you might want to include in your wardrobe:

The Classic Western Shirt
And of course for women, it's best fit also on jeans and on shorts. And mixed it up with your favorite boots.. and you're on the go!