White leggings are the hardest colour to get right, so read this before buying. White shows sheerness more than any other shade, which means the knit has to be substantially heavier to stay opaque under stretch.
The pairs listed here are the ones we would wear ourselves — several are lined specifically for opacity. We would still recommend the squat-proof test in daylight before wearing white to a class, and sizing up rather than down, since stretched fabric always thins.
Our sizing runs about one size smaller than US sizing — if you are between sizes, size up. The size guide shows you how to measure.