Second the Tailored Sportsman shirts - I ended up buying two last years, after being sure that I was going to go RJ - the TS snap collars aren’t quite as pointy, fit my larger bust beautifully without gapping.
However, I also have to say that I LOVE my Ariat long sleeve show shirts! They are the ones that snap all the way down the front, and the sides and sleeves are made from mesh. I found one on clearance last year at Dover, and another at Equus Now, and they are really my go-to shirts, especially in hot weather - they layer beautifully under the more form-fitting coats, and are so cooling. i think they are called the Triumph shirts, and they are amazing. They just don’t have as many colors and pretty patterns as the TS, but I still love them.
I show jumpers, so I don’t get to wear them as often as I like - most days I’m in my Swing sun shirts by Bette and Court - show shirts I usually hold out for Sundays…