Because it's related to the theme of green and purple, I'm going to post an illustration from a children's annual. It's from the Monster Book for Boys† and shows three colourfully dressed cowboys. One is wearing green and purple. Real cowboys, I suspect, were not so picturesque.
† The website Old Classic Car has a page "Old childrens books and annuals that feature cars". One of the front covers shown is the same as my Monster Book for Boys. The author says their copy was a Christmas gift from 1954, so perhaps the book was published in 1953 or 1954.