-Feel free to ask questions in the comments! Hi! It's Luna! The measurements you need is this: 1. Waist 2. Hips 3. Top of legs 4. Knees 5. Bottom of legs 6. Ankles 7. Belly button to floor You might want to measure the distance between each measurements for when you draw it and measure in centimetres around the circumference. Still do research to find out which way is best for you, and make sure you can swim. You might want to watch videos on how to make one, and how to make a monofin if it's too expensive to buy one. You can even use a different fabric if you want to use it as a blanket! -Luna