Canvas: 1024x1024 RGBA PNG, transparent background.

Style: match the attached base exactly (painterly steampunk, dark ink linework, weathered leather/knit textures, palette of charcoal-black, teal, ivory, tarnished brass/copper, with gear, rivet, buckle and teal-gem details).

Facing: front, symmetric about x=512 (the eyes glance to viewer's left; the head and body are square to camera).

Placement: the garment must fully cover the base's existing leather coat and lapels. Shoulders run off both canvas edges (x=0..1024) with the shoulder line at about y=880 at the edges, rising to about y=760 near x=215 and x=805. The torso fills down to the bottom edge at y=1024.

Neck opening is centred at x=512, spanning x=370..655, with its top edge at y=835..850 so it tucks just under the jawbone (jaw bottom about y=845, x=430..600). Draw nothing above y=750 and never paint over the skull. Hoods must be shown down, bunched behind the neck and visible only at the sides (x=330..440 and x=585..695, y=760..860), never rising behind the head.

Variants (baggy, oversized, slouched shoulders, all steampunk-flavoured): 01 charcoal hoodie with brass grommets and gear-pull drawstrings; 02 teal hoodie with leather shoulder patches; 03 oversized cable-knit jumper in oatmeal with copper buttons at the shoulder; 04 baggy black knit jumper with a brass gear emblem; 05 rust-brown chunky roll-neck jumper with the roll sitting below the jaw; 06 patched, darned grey jumper with riveted leather elbow and shoulder patches; 07 baggy open linen shirt in ivory, collar splayed, with an exposed ribcage drawn in the base's bone style; 08 open teal shirt over a brass-buckled harness; 09 striped engineer's jumper with brass pressure-gauge pin; 10 hoodie with copper pipework stitched along the seams; 11 rare: oil-black open shirt with glowing teal gem buttons and a gear-filigree collar; 12 legendary: brass-plated knit mail jumper with exposed clockwork chest panel.

Only garment pixels; everything else fully transparent with clean, anti-aliased edges.

Outputs: artifacts/jumper_01.png .. artifacts/jumper_12.png, plus artifacts/jumper.json as an array of {"file","name","weight"}. Weights must sum to 100: 01:14, 02:12, 03:12, 04:11, 05:10, 06:9, 07:9, 08:7, 09:6, 10:5, 11:3, 12:2. Write artifacts/jumper_01.png .. artifacts/jumper_12.png and artifacts/jumper.json: an array of {"file","name","weight"} with weights summing to 100, rarer lower.