I know this is an old comment but I thought I'd answer in case someone else has the same problem with this or a similar mod. This is made for the UNP body and if you are pairing it with armor or clothing that is NOT UNP, like vanilla, for instance, the shape of the legs will be different and the leggings will clip. I had this same problem with another type of stockings mod. Turned out the armor my character was wearing was for vanilla bodies and I didn't realize it. Switched to a UNP armor and the stockings fit perfectly.
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https://www.nexusmods.com/skyrim/mods/22878