Fits were all over the place. Pre-war photos show fits closer to this, but later as all size guys hit the air corp, jackets were all over the place. Jimmy Stewart's looks like he borrowed his from a little brother. He had a trim chest measurement, but that size didn't have the sleeve length he really needed.
Now how you LIKE it to fit, that's different. When a jacket fits right, it doesn't pinch and has some comfort in its range of motion, but agree, it shouldn't be baggy. Very Cinderella-kind of thing. You're particular body may like high arm holes, or may like wider sleeve tops, As you try different contracts, you find some are a good match, some aren't...
Now how you LIKE it to fit, that's different. When a jacket fits right, it doesn't pinch and has some comfort in its range of motion, but agree, it shouldn't be baggy. Very Cinderella-kind of thing. You're particular body may like high arm holes, or may like wider sleeve tops, As you try different contracts, you find some are a good match, some aren't...