I found that a great way to take your summer leggings along to colder winter weather is to layer them, as done here, where I wore my transparent lace leggings over another basic black leggings. Which at first were deemed as a very limiting piece of clothing, these lace leggings turned out to be surprisingly versatile; during fall I wore them here with shorts and red leopard-lined blazer and during summer I wore them here under a baby doll top and leather jacket. Now, in much colder weather, when overlapped, this pair managed to provide extra warmth and comfort. And not mention the additional lovely lace texture :)
PS: I'm catching a flight to Malaysia tomorrow morning! So I'm on hectic mode, busy packing and wondering what else I might be forgetting...