Proper fit/measurements for aviator jacket

So I've been looking at aviator jackets online and been trying to figure out what measurements I should be looking for. I attached a picture in me of a brown jacket in a similar cut that's 27in laying flat in the chest and 26in from the shoulder to bottom hem. This is the widest I own-- after that I put one thats 21in and one that's 23in in the chest. I'm looking, for example, at a vintage Schott online that's 25 in the chest—would that be an appropriate fit for the style?
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