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I think the thing that makes the A-2 and the G-1 is the webbing in the bottom and the collar. The waist is more pronounced and the collar is widely recognized as a dressed up detail.
I think A-2 or G-1 with shirt and tie is a great style!!
Not being a native english speaking I have never really understood how this works. Only thing I've ever heard is "shammy", but do you know how they pronounce it in american english? My dictionary didn't help.