Equestrian competition shirt with chest protector

Competition Shirt with Dickey
Tuxedo Front

This is an interesting product that allows you to create a high-neck look around your neck and chest during competitions, especially in hot weather.
I bought it thinking it would help with the heat, but I've never worn it.
When you wear this under a dress shirt, it looks like you're wearing a show shirt.
If you're interested and understand its purpose, thank you.