This is a high-detail cosplay costume set based on the character Asahina Mahiru from 'World Plan' (世界计划), featuring a layered sailor-style dress with lavender puff sleeves, white bodice, black Peter Pan collar with white trim, and asymmetrical plaid skirt in pastel purple and white. The ensemble includes a structured black corset waistband with silver-toned buckle closures, detachable black cross-lacing arm warmers, thigh-high legwear with black ruffled hems, and coordinating accessories: black shoulder bag, hair ribbons, lace-up gloves, foot cuffs, leg rings, and decorative lacing straps. Designed for anime/manga cosplay events, stage performances, or themed photoshoots, the outfit emphasizes gothic-lolita and schoolgirl aesthetics with precise tailoring and thematic consistency. Fabric appears to be polyester blend for durability and shape retention; lightweight construction (0.55kg total) ensures comfort during extended wear. Ideal for fans of rhythm games and idol culture, especially those familiar with Project SEKAI's crossover universe. The L size fits average adult female measurements, with adjustable elements for customization.