Materials:
1. Green Long-Sleeved Shirt and Pants: Choose a lime-green or neon green shirt and pants.
2. Bleach Bottle Labels: Create labels with the word "Chlorine" in a bold font and attach them to the clothing like labels on a chemical container.
3. Utility Belt: Wear a utility belt around your waist.
4. Gas Mask: Get a gas mask with a green filter or make one out of cardboard and colored film.
5. Chlorine Symbols: Cut out chlorine symbols (Cl2) from white felt and attach them prominently on your shirt and pants.
6. Yellow Cape or Sash: Add a bright yellow cape or sash that flows behind you like a hazardous chemical cloud.
7. Goggles: Wear protective goggles to enhance the chemist/hazmat suit look.
8. Rubber Gloves: Put on yellow rubber gloves to complete the safety gear theme.
9. Boots: Wear knee-high green or black boots to represent the chemical containment suit.
10. Chlorine Canister Prop: Create a chlorine canister prop using a cardboard tube and label it "Chlorine Gas" to carry around or wear on your back.
By combining these elements and accessories, you'll create an eye-catching and playful Chlorine costume.