Striped cotton shirt from dejure (a sub-label of japanese DC brand 'brains'). The colour is a rather flashy purple, with wide white stripes. The shirt has a single chest pocket, buttoned cuffs, and a loooseish cut. The most striking design detail is the collar, which is both unusually shaped (sort of angled, bowing at the edges?) and also has the appearance of being a button down collar but actually isn't (it's just buttons sewn on top of the collar points).

Marked size 41 (mens/unisex), likely fit approx AU M
Check measurements to confirm fit
All measurements taken flat

Shoulder width: 47 cm
Width (at underarms): 55.5 cm
Length (neck to hem): 80 cm
Sleeve length: 62 cm
Hem width: 56 cm

100% cotton
Made in japan
Circa 1980s