Also known as: 旧スク, 旧々スク, 旧スクール水着, kyuu_scho, kyuukyuu_scho, きゅーすく
A School Swimsuit, usually blue or black in color, with thicker shoulder straps, vertical seams over the torso, and a School Swimsuit Flap over the groin. Sometimes has a white Name Tag stitched across the chest.
If it lacks the groin flap, but is otherwise the same, it's a New School Swimsuit instead; if it has thin shoulder straps distinct from the main body of the suit and lacks seams, it's a Competition School Swimsuit.