The Universal Self Defence regular all white uniform with the red Usda logo on the front and Universal Self-Defence Academy printed across the back is the approved correct Usda uniform and is what you need to wear for Universal Self Defence classes.
Please check with your instructor &/or look at other uniforms sizes worn in your Usda class so you are able to ordered the correct size.
The regular Usda uniform also comes with a white belt.
If you just need to replace your uniform pants or jacket or belt you can buy them individually but it will work out cheaper to buy a complete uniform if other parts of your uniform are worn and will need replacing in the short term.
Before adding any badges to your uniform always seek your instructors permission first.