Striped oversized button down shirt

A relaxed fit button down shirt featuring a classic collar and shoulder pads, crafted from a soft material with a fluid drape, which gives it a very casual look. The shirt is a very dark navy, almost black, with navy buttons on the front and cuffs. Unfortunately there are no labels in the shirt, but it was bought secondhand on Zadaa a couple years ago, where it was listed as the brand ‘Stockmann’ and a size L. There is some wear on the white stripes throughout, which I have shown in a few spots in image 10-13.

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Shoulder width: ~42 cm
Armpit to armpit: ~55 cm
Length: ~78 cm
Sleeve length: ~61 cm

See the last image for visual measurement explanation.
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No material label.