Army Air Corp WWII uniform – Regular dress pants – Dark Blue

The dress pants has a tag inside which reads:
“CUSTOM TAILORED
APPROVED BY HQ. A.M.C.
U.S.A.F. CERTIFICATE NO. I-23
THIS GARMENT HAS BEEN MFD.
IN STRICT ACCORDANCE WITH
SPEC. NO. Mil C-3312-A
WITH APPROVED A.F. MATERIALS”