i need a project idea for the internal assesment project. I want it to do something with sewing, like using equations in making a garment.

That looks like a good idea. You can use equations to

make a pattern larger or smaller
use materials with different costs
use different widths of material (45", 36", or 54")
make a long skirt versus a short skirt

i don't know how to make it into more math statistics related than a fashion design.

What differences in width and length of the pattern pieces would you have to make if you increased or decreased the pattern two sizes? How much more or less material would you use?

What are the differences in the cost of the garment if you use material that costs $8 a yard, $15 a yard, or $25 a yard?

If you need 4 yards of 45" material, how much more material would you need if you used 36" wide fabric? How much material would you need if you used 45" fabric?

To come up with a project idea that combines sewing and equations, you can consider creating a project that involves designing and constructing a garment with specific measurements using mathematical equations. Here's a step-by-step process on how to get started:

1. Define the goal: Identify the specific objective of your project. For example, you might want to design a dress that fits well using mathematical equations to determine the dimensions and proportions.

2. Research garment measurements: Study the standard measurements for designing clothes. This will help you understand the different aspects you need to consider, such as bust, waist, hip, and length measurements.

3. Formulate equations: Determine the equations that you will use to calculate the garment dimensions. You can employ various mathematical concepts like ratios, proportions, and geometry. For example, you can use the Golden Ratio to determine the ideal proportions for certain garment elements.

4. Collect data: Take measurements from yourself or your intended audience to create a dataset that reflects real-life body measurements.

5. Create a design plan: Use your equations and measurements to create a detailed design plan for your garment. Consider factors such as fabric choice, sewing techniques, and styling elements.

6. Construct the garment: Use your design plan to cut and sew the garment. Follow appropriate sewing techniques and ensure you accurately transfer your measurements onto the fabric.

7. Test and refine: Once the garment is complete, test it on the intended wearer(s) to evaluate the fit and overall success of your design. Gather feedback and make adjustments if needed.

8. Document and reflect: Document your entire design process, including your equations, measurements, sketches, and sewing techniques used. Write a reflective essay discussing your decision-making process and the overall outcomes of your project.

Remember to consult your teacher or supervisor to ensure your project meets the specific criteria for your internal assessment.

By combining sewing and mathematical equations, you can create a unique and interesting project that showcases your creativity, practical skills, and ability to integrate different disciplines.