Vintage 40s WW2 US Army HBT Herringbone Jacket Shirt Gas Flap Patch GA24

Vintage 40s WW2 US Army HBT Herringbone Jacket Shirt Gas Flap Patch GA24 some staining, looks like blood? Was used by active duty serviceman in WWII. Size unknown, see photos for measurements. Fits my 6'2 slender athletic frame decently, maybe a little short in the arm length for me.