Originally Posted by SunnyDraco
Make sure you don't forget have matching saddle pad to your shirt. And if you can get the same color as accents elsewhere in his tack (headstall, browband, chest collar), you can get more visual appeal. Well dressed and coordination between horse and rider :)
Most any solid color will do (bright, pastel, or fluorescent). I would recommend to stay away from loud patterns (it would draw attention from your boys neat coat coloring) and from white, grey, and black.
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If she is showing stock horse western pleasure (assuming your appy is full blooded) then her best bet is to show with plain leather tack with silver (no color accents). From what I see on the circuit the only things that should match are the shirt and pad. Also breast collars are not the norm in western pleasure.
Personally, I think a plain black shirt looks really sharp. Dark colors show up against arena walls well. If you don't want to go dark I think Orange would look nice. Like an orange shirt with a saddle pad with a little orange in it.