So I found the purple show shirt yesterday, and today I found the jacket. Not at The Snooty Fox Equestrian Consignment (although I did find out first hand why snooty is in their name. The coat is black, making an interesting contrast with the purple shirt. All I need now is a stock pin (easy enough, they don't come in sizes) and I'm good to go. For those of you who care, here is the coat and blouse:
Cheers!