Answered: Add a bit of Texas
Of course, boots are an easy Texas style to add - and I just love these red ones (photo on the right.) Again, a bit out of my price range - but I think a good pair of leather boots might be worth an investment.
Hairstyle is another option. Everything is big in Texas, right? If I was going to go big - I'd go big with a messy bun / pony tail like this picture on Pinterest. But I think I like my cowboy hat too much to go too big on the hair!
Again, the real key is find what fits with what you have and that is easy enough. As I finish writing this post - I'm thinking more and more that some real cowboy boots might suit me fine for the rodeo this year....