I just got back from IHSA Zones and that coat, while cute, is not going to fit in on most IHSA teams. I saw 98% plain navy or black 3-button hunt coats. A few teams had subtle piping on the lapel in school colors, and 1 or 2 girls had a 4 button coat with plain (not shiny) buttons.
It’s true that IHSA teams often share coats, but it can get pretty dicey if the only girl with a coat that fits you has her class just before yours and she’s in the ring for awards but you’re supposed to be mounting up for your flat class at the same time. I get super stressed when I’m not dressed in plenty of time and then I ride stiff!
I’d always recommend getting your own gear if you can, so you can control when you get dressed, how clean it is, whether it fits, etc., and for $300 (the cost of that coat new) you can find some beautiful jackets! I love the Irideon Kismet – I just wore it this weekend, and it drapes beautifully, especially for a soft shell, and it’s very cool and breathable.
ETA: Just saw that you received the coat!! So I gather it was a gift. In that case, you can either sell it on Facebook (English Tack Trader is a great group) and put the money towards a more traditional coat, or if you want to keep it (which is also a totally valid choice – it is a cute coat!) there are lots of used coats for sale on the same group or on ebay. Figure out your size and go hunting!