Wool is anti-bacterial and odor resistant so you do not need to clean it often. When you do wash, use Wool cycle, then shape and air dry. Like your pets, wool should never be put in the dryer.
Dry clean if you are fancy.
Ivanhoe is very close to American sizing, so stick with what you usually buy. For the waist sizes, don't freak out! Most companies use vanity sizing, vanity is in short supply in Sweden so they use the actual sizes in inches.