Ribbed-knit sweater in navy with a mock turtleneck collar and long sleeves with fold-over cuffs. Features a modular construction with button-detachable sleeves and sides, secured by two vertical rows of dark tone-on-tone branded buttons engraved SETCHU running along both side seams and across the shoulders. The third image reveals the garment opens fully at the sides and shoulders, with a separate inner body section featuring a tie fastening at the waist. The construction allows the sleeves and outer panels to be unbuttoned and worn separately.