These are from the 1930s and were likely a children's playsuit, but they could work for a smaller-sized woman (see measurements below). They button up the front, and also have a drop seat that opens and is connected to the attached waist ties (see next to last photo). The fabric is a striped cotton, and the maker is "Kladezee"
Size: approximately size xs (measurements of wearer should not be at max measurements of playsuit--there should be some drape)
Waist: 33" (uncinched)
Torso length (from shoulder to crotch): 27.5"
Shoulder width: 13.5"
Sleeve length: 16.5"
Condition: Very good. A few faint marks near side hem on front bottom of left pant leg (see last photo). Because of location/size, these aren't really noticeable. This playsuit has been cleaned.