Warm coat, boots gloves and warm hat.
It will be cold. Wear good thermal clothing like already mentioned and also good winter socks (wool or synthetic).
Hiking boots. Thermal underwear. Winter Base layers, fleece etc... A good hat that can cover your ears and secures under your chin. Sheepskin gloves or a choice of thinsulate type thermal gloves. Crampons can be useful depending on current weather conditions. YMMV
Winter clothes
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