Lookin' Good!
It is not as expensive or complicated for you and your horse make a good impression in the ring. There are a wealth of resources on line these days. Horse and Rider Magazine has a great link to their publication, http://www.equisearch.com/horseandrider/, The most current issues have articles on banding and tail grooming. All of the articles are also archived so search to your heart's content.
Ebay is a good place to shop for show clothes and tack. Let the buyer always beware however...check out the sellers history and always ask lots of questions.