Vellum paper is the best paper to be used when copying patterns for sewing as you can see through the paper. But you will want to remember to get a size big enough to fit over the entire piece of fabric.
The best is vellum paper. This is a see through paper that allows you to dram the sewing pattern without mistakes. It's easy to mark, easy to store and you can find it in specialized shops.
Dressmaker's tissue is perfect for creating sewing patterns. It is lightweight, easy to mark and folds up nicely for storage. Larger fabric shops carry dressmaker's tissue. You can also order it online.
Many people that I know that create their own sewing patterns swear by using either butcher paper or parchment paper, as it is thin, lightweight, and you can generally see through it.
Vellum paper is the best paper for drafting sewing patterns. The paper is transparent when it is exposed to light, which makes it possible to clearly see the pattern that is being drafted.
the paper I would use comes down to personal preference. I you would want to use regular paper that would be fine but you can alos used different types as well.