How about actual costumes from this site to help bring you back to the good old west? (abckidsinc.com)
If you don't have actual costume makeup, use a shiny red lip gloss and drip it down your mouth to tie the look together. (cosmopolitan.com)
In my six years working as a Walt Disney World «cast member» (that's what they called us), I did everything from working attraction lines, to taking pictures of park guests with costumed characters, to being an actual costumed character (more on that one in a minute). (businessinsider.com)