Blue striped dress / pinafore dress from 60s, approx L

A pretty blue shade, striped dress or pinafore dress from the 60s. The sleeveless dress has a round neckline and a chest-length slit in the front with fabric loops and metal buttons. There is a pocket on the right hip. The dress, which slightly widens towards the hem, only has breast darts.
The shirt and belt in some photos are photo props.

Brand: no brand, but made by the clothing industry (size marking, overlock trim)
Country of manufacture: probably Finland
Period: 1960s
Size: size tag 44,the size is about L, the dress does not have a zipper at all, so please take this into account when comparing measurements
Material: strong, blue shade vertically striped cotton. The dress is unlined.
Dress measurements: chest  approx. 110cm, waist 108cm, hip  approx. 112cm, shoulder width 40cm, wrist circumference 48cm, front length from shoulder to hem 103cm + 3½cm turn
Condition: very good, slight color wear in the armpits and button stand
​Delivery time: 2-5 days