Tights: Ewww...

Kilt hose and a traditional wool kilt is enough for temperatures down to 20 deg F. If need be, wear another pair of socks, either underneath the kilt hose or over and cuff the kilt hose over the socks. Just make sure that the second pair of socks are a complementary or matching color. But don't put tights on. At that point, as was said above, you might as well just wear trousers.

-J