Iceland,what jacket to wear ?

Short trip to Iceland this weekend, temperatures are well below freezing at night and hover at zero to minus 3 deg C during the day. Got quilted army thermal trousers good boots and quilted jacket hats gloves etc. Some of the time I will want to wear one of my sheepskins, so what should I choose
B3,Anj4, m445 or Irvin ?
Wearing heavy jackets for extended periods can be exhausting.