Can wearing two pairs of trousers affect running speed in cold weather?

There will be an impact, but if you are not a professional athlete, the impact will not be great, because wearing two pairs of pants will also affect the pace, plus two pairs will affect the pace. Everyone should know that running in shorts is the fastest. Who has ever seen someone wearing pants in a high-level straight race in an international arena, let alone two pairs of pants, which shows that it still has an impact.

However, it's cold in winter, so it's ok to keep warm during training and wear two pairs of sweatpants.