What do you think of Plain Show Shirts for Horsemanship, Trail, Pleasure and Western Riding?

I’ve noticed a growing trend in plain show shirts, especially in the horsemanship classes.  I put a poll up to see what people are thinking.  What are your thoughts on these vs. the more popular shirts with custom crystal designs and patterns?  What classes do you think these shirts are acceptable in? I’d love to hear what people really think about them!