the most important tip for me is to layer layer layer! so get loads of chunky knits and cardigans, as well as loads of thin long sleeve tees. this is so important as the weather is quite crazy, and can go from mild to absolutely freezing within a few hours.
id also say to invest in a big, warm gorgeous coat … or a few :) wool and fur would work well.
for the airport i love super soft fabrics like cashmere, and remember to layer lol.