Nieswadony Grouping:
P41 #1:
Rounded pocket and stamped name above pockets indicates post-WW2 issue. Rounded pocket P41’s are sometimes called “P47”. Found starched and pressed.
Herringbone twill (HBT) was chosen for its resistance to tearing (source: https://books.google.com/books?id=FCTDCwAAQBAJ&pg=PT29&dq=hbt+rip&source=bl#v=onepage&q=hbt%20rip&f=false; click blue mark by scroll bar), and its ability to prevent rips from spreading (source: https://www.wwiiimpressions.com/collections/uniform-herringbone-twill-m1941), like a precursor to ripstop that would be common in more recent uniforms.
Buttons:
Stamps:
Name stamped above pocket.
P41 #2:
This jacket was worn more than the one above. Found starched and pressed. Perhaps this was the “field” uniform while the other was for “inspection”.
Cuffs:
Markings:
Name also stamped above pocket. 
Rank appears to be applied with a marker.
Collar area:
P44 #1:
Modified for hunting with “poacher’s pocket” on back.
Stamps and Markings:
Rank also applied with marker.
Name stamped above pockets like above P41’s.
Other Examples:
Unmodified P44 #2:
This P44, like most P44’s, was likely used in Korea since it arrived too late to be used in WW2.
Stamps:
Annotated stamp text. 
Name written on inside back in marker. Contract 47257 was to S Rosenbloom, Inc. of Cambridge, Maryland and dated between January 22, 1945 to April 1945 (source: http://www.usww2uniforms.com/USMCquery.html).
Inside:
“Gas flap”. 
Inside.
Buttons:
No markings on buttons. There are buttons behind the collar on the back as if to attach a hood.
Modified P47:
Some P47’s were modified by removing the lower pockets so they can be comfortably tucked in for garrison duty.
Stamps and Markings:
Name patch is likely private purchase. 
Name hand-written in. 
Dry cleaner’s tag?
Buttons:
