What is "lopapeysa"

Lopapeysa or Icelandic sweater is an Icelandic style of sweater originating in early or mid-20th century, at a time when imports had displaced older and more traditional Icelandic clothing and people began to search for new ways to utilize the plentiful native wool. It is believed that the sweaters are patterned on Greenlandic women's costume, or even inspired by South American, Turkish or Swedish textile patterns.