Because the weather in Iceland is very unpredictable and rather cool or cold,
the most basic and necessary clothing items are a sweater, a windbreaker, rainwear
and sturdy walking shoes. You should also bring a swimsuit, even if you come in
winter. There are many warm open-air thermal pools and indoor swimming pools all
over the country. If you plan to go camping, you need to bring a thermal sleeping
bag and warm underwear and socks.
Icelanders in general dress well, especially when they go out to fine restaurants
or theaters. They find it important to dress neatly in public and spend much money
on clothing. The country is known for its woolen sweaters.