Late 40s/Early 50s Royal blue cotton twill athletic shorts. 
4 Cat eye buttons on each side.
Elastic waist.
Loose fitting elastic in hem that has been partially cut (not visible) to allow for comfortability but still has stretch.
Southern Co label tagged 26.
Best for modern 00-0
20-25” waist
14” rise
40” hip below last buttons
11.5-13” thigh opening
14” total length/outseam