Unless they were "privately made" donated, dedicated type flags.
Before the War, flags had been made at Schuylkill Arsenal.
Since the Government assumed the responsibility for state units raised for Union service, SA was quickly over-burdened so the Quartermaster Department established additional flag depots at New York and Cincinnati.
Trivia. NUG... NY Depot did square cantons with painted gold stars in five horizontal rows. Philadelphia Depot did the regulation long rectangle canton with gold stars in two concentric rings. Cincy did a rectangular canton but arranged the stars in rows.
Being the depot system, flags were arsenal made up as kits, and distribute dto sub-contractors for completion.
NUG, they were machine sewn as the "long seams" lent themselves well to quick production versus hand-sewing.
In gleichem Schritt und Tritt, Curt Schmidt
Not a real Civil War reenactor, I only portray one on boards and fora.
I do not portray a Civil War soldier, I merely interpret one.