You should wear what ever is the best thing that you have. You can never be over dressed. Starch up a button up, or wear your best polo. At shows when show clothing is optional it shows the judge that you respect their time if you go above and beyond the requirements and dress up anyways. As for you being scared of getting possibly strange looks, take it as they feel threatened by you, and are wishing that they turned themselves out better. When you look good, you feel more confident and ready for what ever is to come.
Long live your Rein
Rail Royalty custom western show clothing