Question WWII 28th Div enlisted; what kind of shirt was worn under wool 4 button long jacket?

Trying to preserve an enlisted uniform, have wool jacket which I would call Class A? but no shirt. Have a shirt stamped as Khaki with rank and unit patches which I am guessing was issued in 45 to an infantryman furloughed home from Germany to be transferred to the Pacific Theatre. Seems like I have two separate uniforms here?

From my research it sounds like there was an OD worsted wool shirt worn under the wool jacket which would not have had patches?

Thanks for your help

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