Are there rules about what sailors wear and how they sit out?

• No weight for its own sake: competitors shall not wear or carry clothing or equipment for the purpose of increasing their weight.
• The limit: clothing and equipment shall not weigh more than 8 kilograms, not counting a crew harness and clothing worn only below the knee. Class rules or the notice of race may set a lower figure or a higher one up to 10 kilograms.
• The harness: must float, must weigh no more than 2 kilograms unless class rules allow up to 4, and must let the wearer disconnect easily at any time.
• Leaning out: no device designed to position the body outboard may be used, other than hiking straps and stiffeners worn under the thighs. A trapeze is used where class rules allow it.
• Lifelines: where they are required, crews keep their torsos inside them, except briefly for a necessary task.
• Ballast: movable ballast is properly stowed, and water, dead weight or ballast is not moved to change trim or stability.
• Manual power: rigging, spars and movable hull appendages are adjusted only by the power of the crew.
• Skin friction: a boat shall not release a substance, or have specially textured surfaces, that could improve the flow of water along the hull.
• A person in charge: every boat has one on board, named by whoever entered the boat.

Weight on the windward side holds a boat upright and makes it faster in a breeze. Sailors once wore water-soaked jackets to gain it, which is general knowledge and not in the rule book. The limits keep the contest to the crew's own bodies and skill.