In colder weather I wear black full length compression tights. As long as what you're wearing is full length, I don't think it makes a lot of difference if it's black or white because it will be a uniform look under the knickers.
At the beginning of the season I'll typically wear white compression shorts and I stick with the white color because the shorts are not full length. The more important aspect is to make sure you get your shirt tucked in under the shorts so the stripes don't show through the knickers.
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kentref
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