It's tough to say definitively, but in general, leggings tend to be more effective at keeping people warm than jeans.
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Are Jeans or Leggings Warmer? | Best Style Trends. Aug 07, 2022 · The answer to this question is fairly easy, leggings are definitely the warmer choice. Jeans absorb the temperature and leave your legs shivering underneath.
The main difference between the two is in their thermal properties. Thermal leggings are typically made with thermal fabrics such as thermal wool or thermal polyester, which provide superior thermal insulation but can be a bit heavier than fleece-lined leggings.