Vintage 1940s silk Japanese pajama sets from Japan during World War II

this silk pajama set is from Japan during World War ii. yes this is true! got these from a family who's great grandfather bought these four great-grandmother after coming home from Japan during World War II in the 1940s. they have never been worn! size S no tags measurements top shoulder 17 chest 20 length 24 sleeves 21 pants waistline 19.25 rise 15 inseam 25 length 40 condition very good, light stain on blouse and silk snag on pants. please see all pictures.