What size show coat should I wear(Ariat)?

So I'm looking for used show coats online and I noticed an ariat heritage soft shell show hunt coat 4R in ladies. I'm assuming this fits me but I believe once purchased I cannot return. I looked on ariat's sizing chart online for show coats and it seems that it would fit me but I've read from other... show more So I'm looking for used show coats online and I noticed an ariat heritage soft shell show hunt coat 4R in ladies. I'm assuming this fits me but I believe once purchased I cannot return. I looked on ariat's sizing chart online for show coats and it seems that it would fit me but I've read from other that they get larger size than theier street clothes.
I'm size 26 in Ariat breeches and 31.5' chest, 25' in sleeve. What size will work best for me?
thank you!
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