Shirt Colour?

Going to go to a show soon. My horse is a reddish bay (in my avatar) and I'll also be riding a true black minimal pinto. I have a light purple shirt. Will the colours match ok?
In my area, we don't often wear coats because of the heat. But in case it's cold, I have a black coat kicking around.
I ride in tan breeches... Will this all go well together?

Yup, sounds fine, both horses are dark enough to contrast well with a lighter purple, your bay seems more brown than red, so it shouldnt clash with the red tone in the purple.

Purple sounds really nice. Another colour I really like the look of is a pale yellow or 'gold' as they call it.

Looks nice with tweed, blue or black show jacket, if you ever have to wear one :)
Shires Equestrian Products*::*For you*::*Ladies*::*Competition Clothing*::*Ladies Ely Show Shirt
I think I might go for this syle this season :)

This all depends, what sort of show are we talking about here and what level?

Purple looks good on both bay's and black's. So you should be fine

English Show, over fences. Just above entry level basically. After this show, maybe a B-rated show. We'll see.

In that case, your purple shirt should be fine =)