How do you get disqualified? The collar would have to be opened and folded down so as to not look like a tie.
8. In locations with high average heat and humidity on the date of a competition, management can publish in their prize list that jackets will be waived for the du- ration of the competition. Alternatively, management can announce prior to or during a competition that competitors can show without jackets when extreme heat and/or humidity is forecast. This waiver applies to all classes including FEI classes at National Competitions. However, competitors must wear protective head- gear and a shirt with sleeves and collar, without neckwear, and without decoration except as described under .14 below. T-shirts are not permitted. Members of the Armed Services or police units may wear summer uniforms. BOD 1/19/13 Effective 4/1/13.
I have worn light blue when jackets are waived. Sleeves and no stock tie or ratcatcher collar is the thing to remember.
You can now wear a lightweight vest with your shirt (sans stock tie and open throat) when shirts are waved. A friend of mine wore a stylish black vest with her white show shirt at a recognized show last weekend. She looked extremely classy.
I've seen this shirt in person and it is actually quite attractive. Now, I hate the collar and you would need to open it at a show. That being said I don't see you getting DQ'd at a show. I've seen people wearing a black shirt with gold bees scattered over it. That I thought was hideous but to each their own. You could always ask the T.D. if it can be worn.
I have worn solid green at a show, but anything with a pattern is groudns for disqualification. Pond slime green is one of my favorite colors. Wear it for clinics, but I wouldn't take the chance at a recognized show.