Vintage knit jacket with geometric triangle colourful pattern

Zipper is wavy but has no trouble zipping up(see pic). Fully lined. Hand pockets. High neck collar. Slight puff on shoulder sleeve. Ribbed cuffs. Rib trim detail down front and back. Large glossy button at neck with loop closure. No manufacturer tag. Shell: 75%acrylic/25%nylon. Lining:100%nylon. Filling:100%polyester. Labelled size Large. May fit up to a smaller Medium best(see measurements as hips may be tighter). Model is size Small, 5’9. Approx 27in length, 17.5in shoulder seam to seam, 23in shoulder seam to cuff, 22.5in pit to pit, straight cut.