Antique Dutch black dark grey linen flax dress nightdress kaftan undergarment initials GKTM size L

Antique Dutch black dark grey linen flax dress nightdress kaftan undergarment initials GKTM size L. 100% Linen/Flax. Dyed black/dark grey. Originally would have been worn by Dutch gentlemen as an undergarment and also as workwear. Dee v-neck with open tab, criss cross sewn detail at base and embroidered initials "GKTM", long sleeves with handgathering at cuffs (no buttons), A line shape, side dart - simple shift. Size: Chest: 48 inches; Shoulder to shoulder: 21 inches; Sleeve length: 19.5 inches; arm inseam: 18.5 inches; Length: 42 inches. Weight: 530g (allow 1 kg once packed). Good condition. A rare find.